6660000000 has 432 divisors, whose sum is σ = 24651694704. Its totient is φ = 1728000000.

The previous prime is 6659999999. The next prime is 6660000031. The reversal of 6660000000 is 666.

It can be written as a sum of positive squares in 8 ways, for example, as 6189283584 + 470716416 = 78672^2 + 21696^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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 an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 179999982 + ... + 180000018.

Almost surely, 2^6660000000 is an apocalyptic number.

6660000000 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 6660000000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12325847352).

6660000000 is an abundant number, since it is smaller than the sum of its proper divisors (17991694704).

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

6660000000 is an frugal number, since it uses more digits than its factorization.

6660000000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 6660000000 is about 81608.8230524127. The cubic root of 6660000000 is about 1881.4444911741. Note that the first 4 decimals are identical.

Adding to 6660000000 its reverse (666), we get a palindrome (6660000666).

6660000000 divided by its reverse (666) gives a 7-th power (10000000 = 10⁷).

The spelling of 6660000000 in words is "six billion, six hundred sixty million", and thus it is an aban number.