66604631 has 2 divisors, whose sum is σ = 66604632. Its totient is φ = 66604630.

The previous prime is 66604627. The next prime is 66604649. The reversal of 66604631 is 13640666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66604631 - 2² = 66604627 is a prime.

It is a super-2 number, since 2×66604631² = 8872353741292322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66604621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33302315 + 33302316.

It is an arithmetic number, because the mean of its divisors is an integer number (33302316).

Almost surely, 2^66604631 is an apocalyptic number.

66604631 is a deficient number, since it is larger than the sum of its proper divisors (1).

66604631 is an equidigital number, since it uses as much as digits as its factorization.

66604631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 66604631 is about 8161.1660318854. The cubic root of 66604631 is about 405.3543228547.

The spelling of 66604631 in words is "sixty-six million, six hundred four thousand, six hundred thirty-one".