63591318997 has 2 divisors, whose sum is σ = 63591318998. Its totient is φ = 63591318996.

The previous prime is 63591318953. The next prime is 63591319009. The reversal of 63591318997 is 79981319536.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57133428676 + 6457890321 = 239026^2 + 80361^2 .

It is a cyclic number.

It is not a de Polignac number, because 63591318997 - 2¹¹ = 63591316949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63591312997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31795659498 + 31795659499.

It is an arithmetic number, because the mean of its divisors is an integer number (31795659499).

Almost surely, 2^63591318997 is an apocalyptic number.

It is an amenable number.

63591318997 is a deficient number, since it is larger than the sum of its proper divisors (1).

63591318997 is an equidigital number, since it uses as much as digits as its factorization.

63591318997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11022480, while the sum is 61.

The spelling of 63591318997 in words is "sixty-three billion, five hundred ninety-one million, three hundred eighteen thousand, nine hundred ninety-seven".