161223145164 has 72 divisors (see below), whose sum is σ = 412753832400. Its totient is φ = 53056080000.

The previous prime is 161223145159. The next prime is 161223145177. The reversal of 161223145164 is 461541322161.

161223145164 is a `hidden beast` number, since 1 + 6 + 122 + 3 + 14 + 516 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 1205439 + ... + 1332489.

Almost surely, 2^161223145164 is an apocalyptic number.

It is an amenable number.

161223145164 is an abundant number, since it is smaller than the sum of its proper divisors (251530687236).

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

161223145164 is a wasteful number, since it uses less digits than its factorization.

161223145164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127511 (or 127506 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The spelling of 161223145164 in words is "one hundred sixty-one billion, two hundred twenty-three million, one hundred forty-five thousand, one hundred sixty-four".