664116631 has 2 divisors, whose sum is σ = 664116632. Its totient is φ = 664116630.

The previous prime is 664116619. The next prime is 664116653. The reversal of 664116631 is 136611466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664116631 - 2⁹ = 664116119 is a prime.

It is a super-2 number, since 2×664116631² = 882101799141580322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664110631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332058315 + 332058316.

It is an arithmetic number, because the mean of its divisors is an integer number (332058316).

Almost surely, 2^664116631 is an apocalyptic number.

664116631 is a deficient number, since it is larger than the sum of its proper divisors (1).

664116631 is an equidigital number, since it uses as much as digits as its factorization.

664116631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The square root of 664116631 is about 25770.4604343811. The cubic root of 664116631 is about 872.4652108854.

The spelling of 664116631 in words is "six hundred sixty-four million, one hundred sixteen thousand, six hundred thirty-one".