667923631 has 2 divisors, whose sum is σ = 667923632. Its totient is φ = 667923630.

The previous prime is 667923623. The next prime is 667923691. The reversal of 667923631 is 136329766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667923631 - 2³ = 667923623 is a prime.

It is a super-2 number, since 2×667923631² = 892243953696448322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667923691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333961815 + 333961816.

It is an arithmetic number, because the mean of its divisors is an integer number (333961816).

Almost surely, 2^667923631 is an apocalyptic number.

667923631 is a deficient number, since it is larger than the sum of its proper divisors (1).

667923631 is an equidigital number, since it uses as much as digits as its factorization.

667923631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 43.

The square root of 667923631 is about 25844.2185217507. The cubic root of 667923631 is about 874.1291497851.

The spelling of 667923631 in words is "six hundred sixty-seven million, nine hundred twenty-three thousand, six hundred thirty-one".