63999731564551 has 2 divisors, whose sum is σ = 63999731564552. Its totient is φ = 63999731564550.

The previous prime is 63999731564501. The next prime is 63999731564557. The reversal of 63999731564551 is 15546513799936.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 63999731564551 - 2⁹ = 63999731564039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63999731564557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31999865782275 + 31999865782276.

It is an arithmetic number, because the mean of its divisors is an integer number (31999865782276).

Almost surely, 2^{63999731564551} is an apocalyptic number.

63999731564551 is a deficient number, since it is larger than the sum of its proper divisors (1).

63999731564551 is an equidigital number, since it uses as much as digits as its factorization.

63999731564551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 826686000, while the sum is 73.

The spelling of 63999731564551 in words is "sixty-three trillion, nine hundred ninety-nine billion, seven hundred thirty-one million, five hundred sixty-four thousand, five hundred fifty-one".