63899934881 has 2 divisors, whose sum is σ = 63899934882. Its totient is φ = 63899934880.

The previous prime is 63899934793. The next prime is 63899934907. The reversal of 63899934881 is 18843999836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62742234256 + 1157700625 = 250484^2 + 34025^2 .

It is a cyclic number.

It is not a de Polignac number, because 63899934881 - 2¹⁰ = 63899933857 is a prime.

It is a super-2 number, since 2×63899934881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63899934481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31949967440 + 31949967441.

It is an arithmetic number, because the mean of its divisors is an integer number (31949967441).

Almost surely, 2^63899934881 is an apocalyptic number.

It is an amenable number.

63899934881 is a deficient number, since it is larger than the sum of its proper divisors (1).

63899934881 is an equidigital number, since it uses as much as digits as its factorization.

63899934881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80621568, while the sum is 68.

The spelling of 63899934881 in words is "sixty-three billion, eight hundred ninety-nine million, nine hundred thirty-four thousand, eight hundred eighty-one".