165664123504 has 80 divisors (see below), whose sum is σ = 361582857216. Its totient is φ = 72845798400.

The previous prime is 165664123481. The next prime is 165664123519. The reversal of 165664123504 is 405321466561.

It is a congruent number.

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, 24586824 + ... + 24593560.

Almost surely, 2^165664123504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165664123504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180791428608).

165664123504 is an abundant number, since it is smaller than the sum of its proper divisors (195918733712).

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

165664123504 is a wasteful number, since it uses less digits than its factorization.

165664123504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11294 (or 11288 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 165664123504 in words is "one hundred sixty-five billion, six hundred sixty-four million, one hundred twenty-three thousand, five hundred four".