63990057664 has 28 divisors (see below), whose sum is σ = 136747985584. Its totient is φ = 29533872384.

The previous prime is 63990057631. The next prime is 63990057667. The reversal of 63990057664 is 46675009936.

It is not an unprimeable number, because it can be changed into a prime (63990057667) 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 in 3 ways as a sum of consecutive naturals, for example, 38454732 + ... + 38456395.

It is an arithmetic number, because the mean of its divisors is an integer number (4883856628).

Almost surely, 2^63990057664 is an apocalyptic number.

63990057664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

63990057664 is an abundant number, since it is smaller than the sum of its proper divisors (72757927920).

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

63990057664 is a wasteful number, since it uses less digits than its factorization.

63990057664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76911152 (or 76911142 counting only the distinct ones).

The product of its (nonzero) digits is 7348320, while the sum is 55.

The spelling of 63990057664 in words is "sixty-three billion, nine hundred ninety million, fifty-seven thousand, six hundred sixty-four".