63811306881 has 81 divisors (see below), whose sum is σ = 112299519969. Its totient is φ = 34811541072.

The previous prime is 63811306873. The next prime is 63811306901. The reversal of 63811306881 is 18860311836.

The square root of 63811306881 is 252609.

It is a perfect power (a square), and thus also a powerful number.

63811306881 is a `hidden beast` number, since 6 + 381 + 130 + 68 + 81 = 666.

It is not a de Polignac number, because 63811306881 - 2³ = 63811306873 is a prime.

It is a super-2 number, since 2×63811306881² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (63811306831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 122009886 + ... + 122010408.

Almost surely, 2^63811306881 is an apocalyptic number.

63811306881 is the 252609-th square number.

63811306881 is the 126305-th centered octagonal number.

It is an amenable number.

63811306881 is a deficient number, since it is larger than the sum of its proper divisors (48488213088).

63811306881 is an equidigital number, since it uses as much as digits as its factorization.

63811306881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112 (or 556 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 45.

The spelling of 63811306881 in words is "sixty-three billion, eight hundred eleven million, three hundred six thousand, eight hundred eighty-one".