161164536212520 has 128 divisors (see below), whose sum is σ = 540636873638400. Its totient is φ = 42703469422848.

The previous prime is 161164536212513. The next prime is 161164536212551. The reversal of 161164536212520 is 25212635461161.

161164536212520 is a `hidden beast` number, since 1 + 6 + 1 + 1 + 6 + 4 + 53 + 62 + 12 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 475073824 + ... + 475412943.

It is an arithmetic number, because the mean of its divisors is an integer number (4223725575300).

Almost surely, 2^{161164536212520} is an apocalyptic number.

161164536212520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161164536212520 is an abundant number, since it is smaller than the sum of its proper divisors (379472337425880).

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

161164536212520 is a wasteful number, since it uses less digits than its factorization.

161164536212520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950486944 (or 950486934 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 161164536212520 in words is "one hundred sixty-one trillion, one hundred sixty-four billion, five hundred thirty-six million, two hundred twelve thousand, five hundred twenty".