165256979 has 2 divisors, whose sum is σ = 165256980. Its totient is φ = 165256978.

The previous prime is 165256957. The next prime is 165257077. The reversal of 165256979 is 979652561.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165256979 - 2⁸ = 165256723 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165256079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82628489 + 82628490.

It is an arithmetic number, because the mean of its divisors is an integer number (82628490).

Almost surely, 2^165256979 is an apocalyptic number.

165256979 is a deficient number, since it is larger than the sum of its proper divisors (1).

165256979 is an equidigital number, since it uses as much as digits as its factorization.

165256979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1020600, while the sum is 50.

The square root of 165256979 is about 12855.2315809557. The cubic root of 165256979 is about 548.7652510018.

The spelling of 165256979 in words is "one hundred sixty-five million, two hundred fifty-six thousand, nine hundred seventy-nine".