165708257538 has 16 divisors (see below), whose sum is σ = 339499845216. Its totient is φ = 53888864160.

The previous prime is 165708257531. The next prime is 165708257543. The reversal of 165708257538 is 835752807561.

165708257538 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (165708257531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 336805156 + ... + 336805647.

It is an arithmetic number, because the mean of its divisors is an integer number (21218740326).

Almost surely, 2^165708257538 is an apocalyptic number.

165708257538 is an abundant number, since it is smaller than the sum of its proper divisors (173791587678).

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

165708257538 is a wasteful number, since it uses less digits than its factorization.

165708257538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673610849.

The product of its (nonzero) digits is 14112000, while the sum is 57.

The spelling of 165708257538 in words is "one hundred sixty-five billion, seven hundred eight million, two hundred fifty-seven thousand, five hundred thirty-eight".