656165161 has 2 divisors, whose sum is σ = 656165162. Its totient is φ = 656165160.

The previous prime is 656165131. The next prime is 656165177. The reversal of 656165161 is 161561656.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 476068761 + 180096400 = 21819^2 + 13420^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-656165161 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 656165161.

It is not a weakly prime, because it can be changed into another prime (656165131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328082580 + 328082581.

It is an arithmetic number, because the mean of its divisors is an integer number (328082581).

Almost surely, 2^656165161 is an apocalyptic number.

It is an amenable number.

656165161 is a deficient number, since it is larger than the sum of its proper divisors (1).

656165161 is an equidigital number, since it uses as much as digits as its factorization.

656165161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 37.

The square root of 656165161 is about 25615.7209736521. The cubic root of 656165161 is about 868.9692116554.

The spelling of 656165161 in words is "six hundred fifty-six million, one hundred sixty-five thousand, one hundred sixty-one".