63981000256 has 28 divisors (see below), whose sum is σ = 126973309680. Its totient is φ = 31987725440.

The previous prime is 63981000229. The next prime is 63981000263. The reversal of 63981000256 is 65200018936.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 839715 + ... + 912733.

It is an arithmetic number, because the mean of its divisors is an integer number (4534761060).

Almost surely, 2^63981000256 is an apocalyptic number.

63981000256 is the 146038-th octagonal number.

It is an amenable number.

63981000256 is a deficient number, since it is larger than the sum of its proper divisors (62992309424).

63981000256 is a wasteful number, since it uses less digits than its factorization.

63981000256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86722 (or 86712 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 63981000256 in words is "sixty-three billion, nine hundred eighty-one million, two hundred fifty-six", and thus it is an aban number.