65646631 has 2 divisors, whose sum is σ = 65646632. Its totient is φ = 65646630.

The previous prime is 65646611. The next prime is 65646643. The reversal of 65646631 is 13664656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65646631 - 2¹¹ = 65644583 is a prime.

It is a super-2 number, since 2×65646631² = 8618960323300322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65646601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32823315 + 32823316.

It is an arithmetic number, because the mean of its divisors is an integer number (32823316).

Almost surely, 2^65646631 is an apocalyptic number.

65646631 is a deficient number, since it is larger than the sum of its proper divisors (1).

65646631 is an equidigital number, since it uses as much as digits as its factorization.

65646631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 37.

The square root of 65646631 is about 8102.2608573163. The cubic root of 65646631 is about 403.4014741934.

The spelling of 65646631 in words is "sixty-five million, six hundred forty-six thousand, six hundred thirty-one".