166521060656 has 20 divisors (see below), whose sum is σ = 323101486104. Its totient is φ = 83140032000.

The previous prime is 166521060623. The next prime is 166521060683. The reversal of 166521060656 is 656060125661.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7519745 + ... + 7541856.

Almost surely, 2^166521060656 is an apocalyptic number.

166521060656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

166521060656 is a deficient number, since it is larger than the sum of its proper divisors (156580425448).

166521060656 is a wasteful number, since it uses less digits than its factorization.

166521060656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15062300 (or 15062294 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 166521060656 in words is "one hundred sixty-six billion, five hundred twenty-one million, sixty thousand, six hundred fifty-six".