165917957 has 2 divisors, whose sum is σ = 165917958. Its totient is φ = 165917956.

The previous prime is 165917923. The next prime is 165918031. The reversal of 165917957 is 759719561.

165917957 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95374756 + 70543201 = 9766^2 + 8399^2 .

It is a cyclic number.

It is not a de Polignac number, because 165917957 - 2⁶ = 165917893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165917057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82958978 + 82958979.

It is an arithmetic number, because the mean of its divisors is an integer number (82958979).

Almost surely, 2^165917957 is an apocalyptic number.

It is an amenable number.

165917957 is a deficient number, since it is larger than the sum of its proper divisors (1).

165917957 is an equidigital number, since it uses as much as digits as its factorization.

165917957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 595350, while the sum is 50.

The square root of 165917957 is about 12880.9144473519. The cubic root of 165917957 is about 549.4959094778.

The spelling of 165917957 in words is "one hundred sixty-five million, nine hundred seventeen thousand, nine hundred fifty-seven".