165806875125 has 128 divisors (see below), whose sum is σ = 324174090240. Its totient is φ = 83488320000.

The previous prime is 165806875123. The next prime is 165806875139. The reversal of 165806875125 is 521578608561.

165806875125 is a `hidden beast` number, since 1 + 6 + 580 + 6 + 8 + 7 + 51 + 2 + 5 = 666.

It is not a de Polignac number, because 165806875125 - 2¹ = 165806875123 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165806875123) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4270299 + ... + 4308951.

It is an arithmetic number, because the mean of its divisors is an integer number (2532610080).

Almost surely, 2^165806875125 is an apocalyptic number.

165806875125 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165806875125 is a deficient number, since it is larger than the sum of its proper divisors (158367215115).

165806875125 is a wasteful number, since it uses less digits than its factorization.

165806875125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38749 (or 38733 counting only the distinct ones).

The product of its (nonzero) digits is 4032000, while the sum is 54.

The spelling of 165806875125 in words is "one hundred sixty-five billion, eight hundred six million, eight hundred seventy-five thousand, one hundred twenty-five".