64149439686831 has 12 divisors (see below), whose sum is σ = 92674229453208. Its totient is φ = 42759864963024.

The previous prime is 64149439686763. The next prime is 64149439686851. The reversal of 64149439686831 is 13868693494146.

64149439686831 is a `hidden beast` number, since 6 + 4 + 1 + 49 + 439 + 68 + 68 + 31 = 666.

It is not a de Polignac number, because 64149439686831 - 2³⁸ = 63874561779887 is a prime.

It is a super-2 number, since 2×64149439686831² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64149439686831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64149439686851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 535616925 + ... + 535736678.

It is an arithmetic number, because the mean of its divisors is an integer number (7722852454434).

Almost surely, 2^{64149439686831} is an apocalyptic number.

64149439686831 is a deficient number, since it is larger than the sum of its proper divisors (28524789766377).

64149439686831 is a wasteful number, since it uses less digits than its factorization.

64149439686831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1071360262 (or 1071360259 counting only the distinct ones).

The product of its digits is 644972544, while the sum is 72.

The spelling of 64149439686831 in words is "sixty-four trillion, one hundred forty-nine billion, four hundred thirty-nine million, six hundred eighty-six thousand, eight hundred thirty-one".