63881915961 has 8 divisors (see below), whose sum is σ = 88879187520. Its totient is φ = 40736294192.

The previous prime is 63881915897. The next prime is 63881915969. The reversal of 63881915961 is 16951918836.

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

It is a cyclic number.

It is not a de Polignac number, because 63881915961 - 2⁶ = 63881915897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (63881915969) 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, 462912366 + ... + 462912503.

It is an arithmetic number, because the mean of its divisors is an integer number (11109898440).

Almost surely, 2^63881915961 is an apocalyptic number.

It is an amenable number.

63881915961 is a deficient number, since it is larger than the sum of its proper divisors (24997271559).

63881915961 is a wasteful number, since it uses less digits than its factorization.

63881915961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925824895.

The product of its digits is 2799360, while the sum is 57.

The spelling of 63881915961 in words is "sixty-three billion, eight hundred eighty-one million, nine hundred fifteen thousand, nine hundred sixty-one".