63990000391 has 4 divisors (see below), whose sum is σ = 66054193984. Its totient is φ = 61925806800.

The previous prime is 63990000379. The next prime is 63990000401. The reversal of 63990000391 is 19300009936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63990000391 - 2⁵ = 63990000359 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 (63990000691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1032096750 + ... + 1032096811.

It is an arithmetic number, because the mean of its divisors is an integer number (16513548496).

Almost surely, 2^63990000391 is an apocalyptic number.

63990000391 is the 159988-th centered pentagonal number.

63990000391 is a deficient number, since it is larger than the sum of its proper divisors (2064193593).

63990000391 is a wasteful number, since it uses less digits than its factorization.

63990000391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2064193592.

The product of its (nonzero) digits is 39366, while the sum is 40.

The spelling of 63990000391 in words is "sixty-three billion, nine hundred ninety million, three hundred ninety-one", and thus it is an aban number.