63865596666663 has 48 divisors (see below), whose sum is σ = 100876479054624. Its totient is φ = 38614211758080.

The previous prime is 63865596666647. The next prime is 63865596666709. The reversal of 63865596666663 is 36666669556836.

It is not a de Polignac number, because 63865596666663 - 2⁴ = 63865596666647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63865596666763) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 688954945 + ... + 689047637.

It is an arithmetic number, because the mean of its divisors is an integer number (2101593313638).

Almost surely, 2^{63865596666663} is an apocalyptic number.

63865596666663 is a deficient number, since it is larger than the sum of its proper divisors (37010882387961).

63865596666663 is a wasteful number, since it uses less digits than its factorization.

63865596666663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109216 (or 109213 counting only the distinct ones).

The product of its digits is 27209779200, while the sum is 81.

The spelling of 63865596666663 in words is "sixty-three trillion, eight hundred sixty-five billion, five hundred ninety-six million, six hundred sixty-six thousand, six hundred sixty-three".