165970817 has 2 divisors, whose sum is σ = 165970818. Its totient is φ = 165970816.

The previous prime is 165970811. The next prime is 165970873. The reversal of 165970817 is 718079561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101586241 + 64384576 = 10079^2 + 8024^2 .

It is a cyclic number.

It is not a de Polignac number, because 165970817 - 2⁸ = 165970561 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (165970811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82985408 + 82985409.

It is an arithmetic number, because the mean of its divisors is an integer number (82985409).

Almost surely, 2^165970817 is an apocalyptic number.

It is an amenable number.

165970817 is a deficient number, since it is larger than the sum of its proper divisors (1).

165970817 is an equidigital number, since it uses as much as digits as its factorization.

165970817 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105840, while the sum is 44.

The square root of 165970817 is about 12882.9661569066. The cubic root of 165970817 is about 549.5542581344.

The spelling of 165970817 in words is "one hundred sixty-five million, nine hundred seventy thousand, eight hundred seventeen".