165630631 has 2 divisors, whose sum is σ = 165630632. Its totient is φ = 165630630.

The previous prime is 165630617. The next prime is 165630637. The reversal of 165630631 is 136036561.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 165630631 - 2¹³ = 165622439 is a prime.

It is a super-2 number, since 2×165630631² = 54867011850916322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 165630593 and 165630602.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165630637) 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, 82815315 + 82815316.

It is an arithmetic number, because the mean of its divisors is an integer number (82815316).

Almost surely, 2^165630631 is an apocalyptic number.

165630631 is a deficient number, since it is larger than the sum of its proper divisors (1).

165630631 is an equidigital number, since it uses as much as digits as its factorization.

165630631 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9720, while the sum is 31.

The square root of 165630631 is about 12869.7564468019. The cubic root of 165630631 is about 549.1785323629.

The spelling of 165630631 in words is "one hundred sixty-five million, six hundred thirty thousand, six hundred thirty-one".