165515117 has 2 divisors, whose sum is σ = 165515118. Its totient is φ = 165515116.

The previous prime is 165515101. The next prime is 165515123. The reversal of 165515117 is 711515561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138744841 + 26770276 = 11779^2 + 5174^2 .

It is a cyclic number.

It is not a de Polignac number, because 165515117 - 2⁴ = 165515101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165515167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82757558 + 82757559.

It is an arithmetic number, because the mean of its divisors is an integer number (82757559).

Almost surely, 2^165515117 is an apocalyptic number.

It is an amenable number.

165515117 is a deficient number, since it is larger than the sum of its proper divisors (1).

165515117 is an equidigital number, since it uses as much as digits as its factorization.

165515117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5250, while the sum is 32.

The square root of 165515117 is about 12865.2678557425. The cubic root of 165515117 is about 549.0508334345.

The spelling of 165515117 in words is "one hundred sixty-five million, five hundred fifteen thousand, one hundred seventeen".