63994357967 has 4 divisors (see below), whose sum is σ = 63995879496. Its totient is φ = 63992836440.

The previous prime is 63994357961. The next prime is 63994358023. The reversal of 63994357967 is 76975349936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63994357967 - 2²⁶ = 63927249103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 63994357897 and 63994357906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63994357961) 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, 695828 + ... + 782409.

It is an arithmetic number, because the mean of its divisors is an integer number (15998969874).

Almost surely, 2^63994357967 is an apocalyptic number.

63994357967 is a deficient number, since it is larger than the sum of its proper divisors (1521529).

63994357967 is a wasteful number, since it uses less digits than its factorization.

63994357967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521528.

The product of its digits is 231472080, while the sum is 68.

The spelling of 63994357967 in words is "sixty-three billion, nine hundred ninety-four million, three hundred fifty-seven thousand, nine hundred sixty-seven".