64631064623431 has 8 divisors (see below), whose sum is σ = 66402813718640. Its totient is φ = 62860629400128.

The previous prime is 64631064623353. The next prime is 64631064623441. The reversal of 64631064623431 is 13432646013646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64631064623431 - 2¹⁵ = 64631064590663 is a prime.

It is a super-2 number, since 2×64631064623431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64631064623441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328368246 + ... + 328565011.

It is an arithmetic number, because the mean of its divisors is an integer number (8300351714830).

Almost surely, 2^{64631064623431} is an apocalyptic number.

64631064623431 is a deficient number, since it is larger than the sum of its proper divisors (1771749095209).

64631064623431 is a wasteful number, since it uses less digits than its factorization.

64631064623431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 656935953.

The product of its (nonzero) digits is 4478976, while the sum is 49.

The spelling of 64631064623431 in words is "sixty-four trillion, six hundred thirty-one billion, sixty-four million, six hundred twenty-three thousand, four hundred thirty-one".