63916861638 has 32 divisors (see below), whose sum is σ = 146634808320. Its totient is φ = 18194569920.

The previous prime is 63916861627. The next prime is 63916861651. The reversal of 63916861638 is 83616861936.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2796423 + ... + 2819186.

It is an arithmetic number, because the mean of its divisors is an integer number (4582337760).

Almost surely, 2^63916861638 is an apocalyptic number.

63916861638 is an abundant number, since it is smaller than the sum of its proper divisors (82717946682).

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

63916861638 is a wasteful number, since it uses less digits than its factorization.

63916861638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5615892.

The product of its digits is 6718464, while the sum is 57.

The spelling of 63916861638 in words is "sixty-three billion, nine hundred sixteen million, eight hundred sixty-one thousand, six hundred thirty-eight".