634387665768 has 16 divisors (see below), whose sum is σ = 1585969164480. Its totient is φ = 211462555248.

The previous prime is 634387665731. The next prime is 634387665773. The reversal of 634387665768 is 867566783436.

634387665768 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13216409680 + ... + 13216409727.

It is an arithmetic number, because the mean of its divisors is an integer number (99123072780).

Almost surely, 2^634387665768 is an apocalyptic number.

It is an amenable number.

634387665768 is an abundant number, since it is smaller than the sum of its proper divisors (951581498712).

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

634387665768 is a wasteful number, since it uses less digits than its factorization.

634387665768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26432819416 (or 26432819412 counting only the distinct ones).

The product of its digits is 731566080, while the sum is 69.

The spelling of 634387665768 in words is "six hundred thirty-four billion, three hundred eighty-seven million, six hundred sixty-five thousand, seven hundred sixty-eight".