63999999999997 has 2 divisors, whose sum is σ = 63999999999998. Its totient is φ = 63999999999996.

The previous prime is 63999999999977. The next prime is 64000000000007. The reversal of 63999999999997 is 79999999999936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62949085930116 + 1050914069881 = 7934046^2 + 1025141^2 .

It is a cyclic number.

It is not a de Polignac number, because 63999999999997 - 2²⁷ = 63999865782269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63999999999907) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31999999999998 + 31999999999999.

It is an arithmetic number, because the mean of its divisors is an integer number (31999999999999).

Almost surely, 2^{63999999999997} is an apocalyptic number.

It is an amenable number.

63999999999997 is a deficient number, since it is larger than the sum of its proper divisors (1).

63999999999997 is an equidigital number, since it uses as much as digits as its factorization.

63999999999997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3954013510734, while the sum is 115.

The spelling of 63999999999997 in words is "sixty-three trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-seven".