63897724817 has 2 divisors, whose sum is σ = 63897724818. Its totient is φ = 63897724816.

The previous prime is 63897724733. The next prime is 63897724823. The reversal of 63897724817 is 71842779836.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40206666256 + 23691058561 = 200516^2 + 153919^2 .

It is a cyclic number.

It is not a de Polignac number, because 63897724817 - 2¹² = 63897720721 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63897724817.

It is not a weakly prime, because it can be changed into another prime (63897724837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31948862408 + 31948862409.

It is an arithmetic number, because the mean of its divisors is an integer number (31948862409).

Almost surely, 2^63897724817 is an apocalyptic number.

It is an amenable number.

63897724817 is a deficient number, since it is larger than the sum of its proper divisors (1).

63897724817 is an equidigital number, since it uses as much as digits as its factorization.

63897724817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28449792, while the sum is 62.

The spelling of 63897724817 in words is "sixty-three billion, eight hundred ninety-seven million, seven hundred twenty-four thousand, eight hundred seventeen".