165925817 has 2 divisors, whose sum is σ = 165925818. Its totient is φ = 165925816.

The previous prime is 165925813. The next prime is 165925819. The reversal of 165925817 is 718529561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101989801 + 63936016 = 10099^2 + 7996^2 .

It is a cyclic number.

It is not a de Polignac number, because 165925817 - 2² = 165925813 is a prime.

Together with 165925819, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165925813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82962908 + 82962909.

It is an arithmetic number, because the mean of its divisors is an integer number (82962909).

Almost surely, 2^165925817 is an apocalyptic number.

It is an amenable number.

165925817 is a deficient number, since it is larger than the sum of its proper divisors (1).

165925817 is an equidigital number, since it uses as much as digits as its factorization.

165925817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 151200, while the sum is 44.

The square root of 165925817 is about 12881.2195463007. The cubic root of 165925817 is about 549.5045863961.

The spelling of 165925817 in words is "one hundred sixty-five million, nine hundred twenty-five thousand, eight hundred seventeen".