63868551536 has 40 divisors (see below), whose sum is σ = 130707777024. Its totient is φ = 30185426880.

The previous prime is 63868551511. The next prime is 63868551613. The reversal of 63868551536 is 63515586836.

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, 1475966 + ... + 1518621.

Almost surely, 2^63868551536 is an apocalyptic number.

It is an amenable number.

63868551536 is an abundant number, since it is smaller than the sum of its proper divisors (66839225488).

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

63868551536 is a wasteful number, since it uses less digits than its factorization.

63868551536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2994669 (or 2994663 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 56.

The spelling of 63868551536 in words is "sixty-three billion, eight hundred sixty-eight million, five hundred fifty-one thousand, five hundred thirty-six".