63879487138755 has 128 divisors (see below), whose sum is σ = 120823274937600. Its totient is φ = 31910686359552.

The previous prime is 63879487138739. The next prime is 63879487138777. The reversal of 63879487138755 is 55783178497836.

63879487138755 is a `hidden beast` number, since 6 + 3 + 8 + 7 + 9 + 487 + 1 + 3 + 87 + 55 = 666.

It is not a de Polignac number, because 63879487138755 - 2⁴ = 63879487138739 is a prime.

It is a super-2 number, since 2×63879487138755² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 644618251 + ... + 644717339.

It is an arithmetic number, because the mean of its divisors is an integer number (943931835450).

Almost surely, 2^{63879487138755} is an apocalyptic number.

63879487138755 is a deficient number, since it is larger than the sum of its proper divisors (56943787798845).

63879487138755 is a wasteful number, since it uses less digits than its factorization.

63879487138755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100470 (or 100464 counting only the distinct ones).

The product of its digits is 8534937600, while the sum is 81.

The spelling of 63879487138755 in words is "sixty-three trillion, eight hundred seventy-nine billion, four hundred eighty-seven million, one hundred thirty-eight thousand, seven hundred fifty-five".