665677631 has 2 divisors, whose sum is σ = 665677632. Its totient is φ = 665677630.

The previous prime is 665677627. The next prime is 665677643. The reversal of 665677631 is 136776566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 665677631 - 2² = 665677627 is a prime.

It is a super-2 number, since 2×665677631² = 886253416827544322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (665674631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332838815 + 332838816.

It is an arithmetic number, because the mean of its divisors is an integer number (332838816).

Almost surely, 2^665677631 is an apocalyptic number.

665677631 is a deficient number, since it is larger than the sum of its proper divisors (1).

665677631 is an equidigital number, since it uses as much as digits as its factorization.

665677631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 47.

The square root of 665677631 is about 25800.7292726388. The cubic root of 665677631 is about 873.1482498091.

The spelling of 665677631 in words is "six hundred sixty-five million, six hundred seventy-seven thousand, six hundred thirty-one".