163220505305256 has 96 divisors (see below), whose sum is σ = 505252358769600. Its totient is φ = 46630180903680.

The previous prime is 163220505305237. The next prime is 163220505305261. The reversal of 163220505305256 is 652503505022361.

It is a happy number.

163220505305256 is a `hidden beast` number, since 1 + 6 + 3 + 2 + 20 + 50 + 53 + 0 + 525 + 6 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9215205 + ... + 20282036.

It is an arithmetic number, because the mean of its divisors is an integer number (5263045403850).

Almost surely, 2^{163220505305256} is an apocalyptic number.

It is an amenable number.

163220505305256 is an abundant number, since it is smaller than the sum of its proper divisors (342031853464344).

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

163220505305256 is a wasteful number, since it uses less digits than its factorization.

163220505305256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29508239 (or 29508232 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 45.

The spelling of 163220505305256 in words is "one hundred sixty-three trillion, two hundred twenty billion, five hundred five million, three hundred five thousand, two hundred fifty-six".