64694922631 has 2 divisors, whose sum is σ = 64694922632. Its totient is φ = 64694922630.

The previous prime is 64694922587. The next prime is 64694922701. The reversal of 64694922631 is 13622949646.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64694922631 - 2³¹ = 62547438983 is a prime.

It is a super-2 number, since 2×64694922631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64694922931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32347461315 + 32347461316.

It is an arithmetic number, because the mean of its divisors is an integer number (32347461316).

Almost surely, 2^64694922631 is an apocalyptic number.

64694922631 is a deficient number, since it is larger than the sum of its proper divisors (1).

64694922631 is an equidigital number, since it uses as much as digits as its factorization.

64694922631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3359232, while the sum is 52.

The spelling of 64694922631 in words is "sixty-four billion, six hundred ninety-four million, nine hundred twenty-two thousand, six hundred thirty-one".