63994695642 has 24 divisors (see below), whose sum is σ = 138812235744. Its totient is φ = 21307401864.

The previous prime is 63994695613. The next prime is 63994695649. The reversal of 63994695642 is 24659649936.

63994695642 is a `hidden beast` number, since 6 + 3 + 9 + 9 + 4 + 69 + 564 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 63994695642.

It is not an unprimeable number, because it can be changed into a prime (63994695649) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1997278 + ... + 2029065.

It is an arithmetic number, because the mean of its divisors is an integer number (5783843156).

Almost surely, 2^63994695642 is an apocalyptic number.

63994695642 is an abundant number, since it is smaller than the sum of its proper divisors (74817540102).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63994695642 is a wasteful number, since it uses less digits than its factorization.

63994695642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4027234 (or 4027231 counting only the distinct ones).

The product of its digits is 75582720, while the sum is 63.

The spelling of 63994695642 in words is "sixty-three billion, nine hundred ninety-four million, six hundred ninety-five thousand, six hundred forty-two".