63993599977 has 2 divisors, whose sum is σ = 63993599978. Its totient is φ = 63993599976.

The previous prime is 63993599881. The next prime is 63993600019. The reversal of 63993599977 is 77999539936.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50479304976 + 13514295001 = 224676^2 + 116251^2 .

It is a cyclic number.

It is not a de Polignac number, because 63993599977 - 2⁷ = 63993599849 is a prime.

It is not a weakly prime, because it can be changed into another prime (63993599077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31996799988 + 31996799989.

It is an arithmetic number, because the mean of its divisors is an integer number (31996799989).

Almost surely, 2^63993599977 is an apocalyptic number.

It is an amenable number.

63993599977 is a deficient number, since it is larger than the sum of its proper divisors (1).

63993599977 is an equidigital number, since it uses as much as digits as its factorization.

63993599977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 781218270, while the sum is 76.

The spelling of 63993599977 in words is "sixty-three billion, nine hundred ninety-three million, five hundred ninety-nine thousand, nine hundred seventy-seven".