161451171520 has 56 divisors (see below), whose sum is σ = 404690122800. Its totient is φ = 61181494272.

The previous prime is 161451171487. The next prime is 161451171547. The reversal of 161451171520 is 25171154161.

It is a super-2 number, since 2×161451171520² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13271155 + ... + 13283314.

Almost surely, 2^161451171520 is an apocalyptic number.

161451171520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161451171520 is an abundant number, since it is smaller than the sum of its proper divisors (243238951280).

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

161451171520 is a wasteful number, since it uses less digits than its factorization.

161451171520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26554505 (or 26554495 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 34.

The spelling of 161451171520 in words is "one hundred sixty-one billion, four hundred fifty-one million, one hundred seventy-one thousand, five hundred twenty".