63681831617 has 4 divisors (see below), whose sum is σ = 63808436160. Its totient is φ = 63555227076.

The previous prime is 63681831487. The next prime is 63681831671. The reversal of 63681831617 is 71613818636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63681831617 - 2¹⁸ = 63681569473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63681831817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63301517 + ... + 63302522.

It is an arithmetic number, because the mean of its divisors is an integer number (15952109040).

Almost surely, 2^63681831617 is an apocalyptic number.

It is an amenable number.

63681831617 is a deficient number, since it is larger than the sum of its proper divisors (126604543).

63681831617 is a wasteful number, since it uses less digits than its factorization.

63681831617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126604542.

The product of its digits is 870912, while the sum is 50.

The spelling of 63681831617 in words is "sixty-three billion, six hundred eighty-one million, eight hundred thirty-one thousand, six hundred seventeen".