165615313 has 2 divisors, whose sum is σ = 165615314. Its totient is φ = 165615312.

The previous prime is 165615287. The next prime is 165615323. The reversal of 165615313 is 313516561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156325009 + 9290304 = 12503^2 + 3048^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165615313 is a prime.

It is not a weakly prime, because it can be changed into another prime (165615323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82807656 + 82807657.

It is an arithmetic number, because the mean of its divisors is an integer number (82807657).

Almost surely, 2^165615313 is an apocalyptic number.

It is an amenable number.

165615313 is a deficient number, since it is larger than the sum of its proper divisors (1).

165615313 is an equidigital number, since it uses as much as digits as its factorization.

165615313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8100, while the sum is 31.

The square root of 165615313 is about 12869.1613168846. The cubic root of 165615313 is about 549.1616019678.

The spelling of 165615313 in words is "one hundred sixty-five million, six hundred fifteen thousand, three hundred thirteen".