165620121169 has 32 divisors (see below), whose sum is σ = 175672103040. Its totient is φ = 155915020800.

The previous prime is 165620121127. The next prime is 165620121181. The reversal of 165620121169 is 961121026561.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 165620121169 - 2²⁵ = 165586566737 is a prime.

It is a super-2 number, since 2×165620121169² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165620121119) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 88994299 + ... + 88996159.

It is an arithmetic number, because the mean of its divisors is an integer number (5489753220).

Almost surely, 2^165620121169 is an apocalyptic number.

It is an amenable number.

165620121169 is a deficient number, since it is larger than the sum of its proper divisors (10051981871).

165620121169 is a wasteful number, since it uses less digits than its factorization.

165620121169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2401.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 165620121169 in words is "one hundred sixty-five billion, six hundred twenty million, one hundred twenty-one thousand, one hundred sixty-nine".