660000000 has 288 divisors, whose sum is σ = 2395306368. Its totient is φ = 160000000.

The previous prime is 659999999. The next prime is 660000007. The reversal of 660000000 is 66.

660000000 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (12) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660000007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59999995 + ... + 60000005.

It is an arithmetic number, because the mean of its divisors is an integer number (8317036).

Almost surely, 2^660000000 is an apocalyptic number.

660000000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1197653184).

660000000 is an abundant number, since it is smaller than the sum of its proper divisors (1735306368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660000000 is an frugal number, since it uses more digits than its factorization.

660000000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 12.

The square root of 660000000 is about 25690.4651573303. The cubic root of 660000000 is about 870.6587691174.

Adding to 660000000 its reverse (66), we get a palindrome (660000066).

660000000 divided by its reverse (66) gives a 7-th power (10000000 = 10⁷).

It can be divided in two parts, 6 and 60000000, that added together give a palindrome (60000006).

The spelling of 660000000 in words is "six hundred sixty million", and thus it is an aban number.