165925813 has 2 divisors, whose sum is σ = 165925814. Its totient is φ = 165925812.

The previous prime is 165925789. The next prime is 165925817. The reversal of 165925813 is 318529561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90288004 + 75637809 = 9502^2 + 8697^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165925813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165925817) 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, 82962906 + 82962907.

It is an arithmetic number, because the mean of its divisors is an integer number (82962907).

Almost surely, 2^165925813 is an apocalyptic number.

It is an amenable number.

165925813 is a deficient number, since it is larger than the sum of its proper divisors (1).

165925813 is an equidigital number, since it uses as much as digits as its factorization.

165925813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 40.

The square root of 165925813 is about 12881.2193910359. The cubic root of 165925813 is about 549.5045819804.

It can be divided in two parts, 1659 and 25813, that added together give a palindrome (27472).

The spelling of 165925813 in words is "one hundred sixty-five million, nine hundred twenty-five thousand, eight hundred thirteen".