15565656066 has 32 divisors (see below), whose sum is σ = 31281562368. Its totient is φ = 5163546000.

The previous prime is 15565656053. The next prime is 15565656137. The reversal of 15565656066 is 66065656551.

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, 2145441 + ... + 2152683.

It is an arithmetic number, because the mean of its divisors is an integer number (977548824).

Almost surely, 2^15565656066 is an apocalyptic number.

15565656066 is an abundant number, since it is smaller than the sum of its proper divisors (15715906302).

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

15565656066 is a wasteful number, since it uses less digits than its factorization.

15565656066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8926.

The product of its (nonzero) digits is 4860000, while the sum is 51.

The spelling of 15565656066 in words is "fifteen billion, five hundred sixty-five million, six hundred fifty-six thousand, sixty-six".