165765631 has 2 divisors, whose sum is σ = 165765632. Its totient is φ = 165765630.

The previous prime is 165765539. The next prime is 165765641. The reversal of 165765631 is 136567561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165765631 - 2¹³ = 165757439 is a prime.

It is a super-2 number, since 2×165765631² = 54956488841656322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165765641) 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, 82882815 + 82882816.

It is an arithmetic number, because the mean of its divisors is an integer number (82882816).

Almost surely, 2^165765631 is an apocalyptic number.

165765631 is a deficient number, since it is larger than the sum of its proper divisors (1).

165765631 is an equidigital number, since it uses as much as digits as its factorization.

165765631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 40.

The square root of 165765631 is about 12875.0002330097. Note that the first 3 decimals coincide. The cubic root of 165765631 is about 549.3276975420.

The spelling of 165765631 in words is "one hundred sixty-five million, seven hundred sixty-five thousand, six hundred thirty-one".