63988976677 has 2 divisors, whose sum is σ = 63988976678. Its totient is φ = 63988976676.

The previous prime is 63988976669. The next prime is 63988976687. The reversal of 63988976677 is 77667988936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58935330756 + 5053645921 = 242766^2 + 71089^2 .

It is a cyclic number.

It is not a de Polignac number, because 63988976677 - 2³ = 63988976669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63988976617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31994488338 + 31994488339.

It is an arithmetic number, because the mean of its divisors is an integer number (31994488339).

Almost surely, 2^63988976677 is an apocalyptic number.

It is an amenable number.

63988976677 is a deficient number, since it is larger than the sum of its proper divisors (1).

63988976677 is an equidigital number, since it uses as much as digits as its factorization.

63988976677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152216576, while the sum is 76.

The spelling of 63988976677 in words is "sixty-three billion, nine hundred eighty-eight million, nine hundred seventy-six thousand, six hundred seventy-seven".