64663898931792 has 40 divisors (see below), whose sum is σ = 185609339527680. Its totient is φ = 21554632977120.

The previous prime is 64663898931743. The next prime is 64663898931829. The reversal of 64663898931792 is 29713989836646.

64663898931792 is a `hidden beast` number, since 6 + 4 + 6 + 63 + 89 + 89 + 317 + 92 = 666.

It is a super-2 number, since 2×64663898931792² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74842475184 + ... + 74842476047.

It is an arithmetic number, because the mean of its divisors is an integer number (4640233488192).

Almost surely, 2^{64663898931792} is an apocalyptic number.

It is an amenable number.

64663898931792 is an abundant number, since it is smaller than the sum of its proper divisors (120945440595888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64663898931792 is a wasteful number, since it uses less digits than its factorization.

64663898931792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149684951248 (or 149684951236 counting only the distinct ones).

The product of its digits is 5079158784, while the sum is 81.

The spelling of 64663898931792 in words is "sixty-four trillion, six hundred sixty-three billion, eight hundred ninety-eight million, nine hundred thirty-one thousand, seven hundred ninety-two".