63878835861 has 24 divisors (see below), whose sum is σ = 93595582080. Its totient is φ = 41975646336.

The previous prime is 63878835857. The next prime is 63878835863. The reversal of 63878835861 is 16853887836.

It is not a de Polignac number, because 63878835861 - 2² = 63878835857 is a prime.

It is a super-2 number, since 2×63878835861² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63878835863) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 345870 + ... + 497376.

It is an arithmetic number, because the mean of its divisors is an integer number (3899815920).

Almost surely, 2^63878835861 is an apocalyptic number.

It is an amenable number.

63878835861 is a deficient number, since it is larger than the sum of its proper divisors (29716746219).

63878835861 is a wasteful number, since it uses less digits than its factorization.

63878835861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152185 (or 152182 counting only the distinct ones).

The product of its digits is 46448640, while the sum is 63.

The spelling of 63878835861 in words is "sixty-three billion, eight hundred seventy-eight million, eight hundred thirty-five thousand, eight hundred sixty-one".