163641332556 has 72 divisors (see below), whose sum is σ = 452770906224. Its totient is φ = 49525741440.

The previous prime is 163641332551. The next prime is 163641332629. The reversal of 163641332556 is 655233146361.

163641332556 is a `hidden beast` number, since 1 + 6 + 3 + 64 + 1 + 3 + 32 + 556 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (163641332551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2837526 + ... + 2894621.

Almost surely, 2^163641332556 is an apocalyptic number.

It is an amenable number.

163641332556 is an abundant number, since it is smaller than the sum of its proper divisors (289129573668).

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

163641332556 is a wasteful number, since it uses less digits than its factorization.

163641332556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5732231 (or 5732226 counting only the distinct ones).

The product of its digits is 1166400, while the sum is 45.

The spelling of 163641332556 in words is "one hundred sixty-three billion, six hundred forty-one million, three hundred thirty-two thousand, five hundred fifty-six".