63990568663 has 8 divisors (see below), whose sum is σ = 73157087232. Its totient is φ = 54830302296.

The previous prime is 63990568619. The next prime is 63990568669. The reversal of 63990568663 is 36686509936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-63990568663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63990568669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1541095 + ... + 1582072.

It is an arithmetic number, because the mean of its divisors is an integer number (9144635904).

Almost surely, 2^63990568663 is an apocalyptic number.

63990568663 is a deficient number, since it is larger than the sum of its proper divisors (9166518569).

63990568663 is a wasteful number, since it uses less digits than its factorization.

63990568663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3126101.

The product of its (nonzero) digits is 37791360, while the sum is 61.

The spelling of 63990568663 in words is "sixty-three billion, nine hundred ninety million, five hundred sixty-eight thousand, six hundred sixty-three".