165065601657 has 16 divisors (see below), whose sum is σ = 240120319680. Its totient is φ = 100029384000.

The previous prime is 165065601593. The next prime is 165065601661. The reversal of 165065601657 is 756106560561.

It is not a de Polignac number, because 165065601657 - 2⁶ = 165065601593 is a prime.

It is a super-2 number, since 2×165065601657² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (165065601257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69907 + ... + 578807.

It is an arithmetic number, because the mean of its divisors is an integer number (15007519980).

Almost surely, 2^165065601657 is an apocalyptic number.

It is an amenable number.

165065601657 is a deficient number, since it is larger than the sum of its proper divisors (75054718023).

165065601657 is a wasteful number, since it uses less digits than its factorization.

165065601657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518744.

The product of its (nonzero) digits is 1134000, while the sum is 48.

The spelling of 165065601657 in words is "one hundred sixty-five billion, sixty-five million, six hundred one thousand, six hundred fifty-seven".