15660166615656 has 64 divisors (see below), whose sum is σ = 39216276126720. Its totient is φ = 5211280048320.

The previous prime is 15660166615627. The next prime is 15660166615673. The reversal of 15660166615656 is 65651666106651.

It is a self number, because there is not a number n which added to its sum of digits gives 15660166615656.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43478401 + ... + 43837103.

It is an arithmetic number, because the mean of its divisors is an integer number (612754314480).

Almost surely, 2^{15660166615656} is an apocalyptic number.

It is an amenable number.

15660166615656 is an abundant number, since it is smaller than the sum of its proper divisors (23556109511064).

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

15660166615656 is a wasteful number, since it uses less digits than its factorization.

15660166615656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361766 (or 361762 counting only the distinct ones).

The product of its (nonzero) digits is 34992000, while the sum is 60.

The spelling of 15660166615656 in words is "fifteen trillion, six hundred sixty billion, one hundred sixty-six million, six hundred fifteen thousand, six hundred fifty-six".