665760000 has 360 divisors, whose sum is σ = 2362618720. Its totient is φ = 165888000.

The previous prime is 665759993. The next prime is 665760023. The reversal of 665760000 is 67566.

It is a hoax number, since the sum of its digits (30) 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 (30).

It is a self number, because there is not a number n which added to its sum of digits gives 665760000.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 9119964 + ... + 9120036.

Almost surely, 2^665760000 is an apocalyptic number.

665760000 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 665760000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1181309360).

665760000 is an abundant number, since it is smaller than the sum of its proper divisors (1696858720).

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

665760000 is an equidigital number, since it uses as much as digits as its factorization.

665760000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 665760000 is about 25802.3254765922. The cubic root of 665760000 is about 873.1842619260.

The spelling of 665760000 in words is "six hundred sixty-five million, seven hundred sixty thousand".