63999999999977 has 2 divisors, whose sum is σ = 63999999999978. Its totient is φ = 63999999999976.

The previous prime is 63999999999917. The next prime is 63999999999997. The reversal of 63999999999977 is 77999999999936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46305997132201 + 17694002867776 = 6804851^2 + 4206424^2 .

It is a cyclic number.

It is not a de Polignac number, because 63999999999977 - 2¹⁰ = 63999999998953 is a prime.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31999999999988 + 31999999999989.

It is an arithmetic number, because the mean of its divisors is an integer number (31999999999989).

Almost surely, 2^{63999999999977} is an apocalyptic number.

It is an amenable number.

63999999999977 is a deficient number, since it is larger than the sum of its proper divisors (1).

63999999999977 is an equidigital number, since it uses as much as digits as its factorization.

63999999999977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3075343841682, while the sum is 113.

The spelling of 63999999999977 in words is "sixty-three trillion, nine hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred seventy-seven".