63991187870 has 8 divisors (see below), whose sum is σ = 115184138184. Its totient is φ = 25596475144.

The previous prime is 63991187849. The next prime is 63991187899. The reversal of 63991187870 is 7878119936.

63991187870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

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, 3199559384 + ... + 3199559403.

It is an arithmetic number, because the mean of its divisors is an integer number (14398017273).

Almost surely, 2^63991187870 is an apocalyptic number.

63991187870 is a deficient number, since it is larger than the sum of its proper divisors (51192950314).

63991187870 is a wasteful number, since it uses less digits than its factorization.

63991187870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6399118794.

The product of its (nonzero) digits is 4572288, while the sum is 59.

The spelling of 63991187870 in words is "sixty-three billion, nine hundred ninety-one million, one hundred eighty-seven thousand, eight hundred seventy".