163578530920 has 64 divisors (see below), whose sum is σ = 438918808320. Its totient is φ = 53645627904.

The previous prime is 163578530917. The next prime is 163578530939. The reversal of 163578530920 is 29035875361.

It is a Smith number, since the sum of its digits (49) 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 15 ways as a sum of consecutive naturals, for example, 12693757 + ... + 12706636.

It is an arithmetic number, because the mean of its divisors is an integer number (6858106380).

Almost surely, 2^163578530920 is an apocalyptic number.

163578530920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163578530920 is an abundant number, since it is smaller than the sum of its proper divisors (275340277400).

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

163578530920 is a wasteful number, since it uses less digits than its factorization.

163578530920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25400434 (or 25400430 counting only the distinct ones).

The product of its (nonzero) digits is 1360800, while the sum is 49.

The spelling of 163578530920 in words is "one hundred sixty-three billion, five hundred seventy-eight million, five hundred thirty thousand, nine hundred twenty".