165321500125 has 64 divisors (see below), whose sum is σ = 221015568384. Its totient is φ = 123026534400.

The previous prime is 165321500119. The next prime is 165321500177. The reversal of 165321500125 is 521005123561.

It is not a de Polignac number, because 165321500125 - 2³ = 165321500117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 111177132 + ... + 111178618.

It is an arithmetic number, because the mean of its divisors is an integer number (3453368256).

Almost surely, 2^165321500125 is an apocalyptic number.

It is an amenable number.

165321500125 is a deficient number, since it is larger than the sum of its proper divisors (55694068259).

165321500125 is a wasteful number, since it uses less digits than its factorization.

165321500125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2095 (or 2085 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 165321500125 its reverse (521005123561), we get a palindrome (686326623686).

The spelling of 165321500125 in words is "one hundred sixty-five billion, three hundred twenty-one million, five hundred thousand, one hundred twenty-five".