15660535656 has 32 divisors (see below), whose sum is σ = 39154904640. Its totient is φ = 5219703168.

The previous prime is 15660535589. The next prime is 15660535741. The reversal of 15660535656 is 65653506651.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 326445 + ... + 371331.

It is an arithmetic number, because the mean of its divisors is an integer number (1223590770).

Almost surely, 2^15660535656 is an apocalyptic number.

It is an amenable number.

15660535656 is an abundant number, since it is smaller than the sum of its proper divisors (23494368984).

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

15660535656 is a wasteful number, since it uses less digits than its factorization.

15660535656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59433 (or 59429 counting only the distinct ones).

The product of its (nonzero) digits is 2430000, while the sum is 48.

The spelling of 15660535656 in words is "fifteen billion, six hundred sixty million, five hundred thirty-five thousand, six hundred fifty-six".