159717973520 has 60 divisors (see below), whose sum is σ = 431971937964. Its totient is φ = 54760446720.

The previous prime is 159717973463. The next prime is 159717973561. The reversal of 159717973520 is 25379717951.

It can be written as a sum of positive squares in 2 ways, for example, as 106369908736 + 53348064784 = 326144^2 + 230972^2 .

It is a Harshad number since it is a multiple of its sum of digits (56).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20368271 + ... + 20376110.

Almost surely, 2^159717973520 is an apocalyptic number.

159717973520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

159717973520 is an abundant number, since it is smaller than the sum of its proper divisors (272253964444).

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

159717973520 is a wasteful number, since it uses less digits than its factorization.

159717973520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40744408 (or 40744395 counting only the distinct ones).

The product of its (nonzero) digits is 4167450, while the sum is 56.

The spelling of 159717973520 in words is "one hundred fifty-nine billion, seven hundred seventeen million, nine hundred seventy-three thousand, five hundred twenty".