68980138644 has 12 divisors (see below), whose sum is σ = 160953656864. Its totient is φ = 22993379544.

The previous prime is 68980138639. The next prime is 68980138663. The reversal of 68980138644 is 44683108986.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 2874172432 + ... + 2874172455.

Almost surely, 2^68980138644 is an apocalyptic number.

It is an amenable number.

68980138644 is an abundant number, since it is smaller than the sum of its proper divisors (91973518220).

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

68980138644 is a wasteful number, since it uses less digits than its factorization.

68980138644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5748344894 (or 5748344892 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 57.

The spelling of 68980138644 in words is "sixty-eight billion, nine hundred eighty million, one hundred thirty-eight thousand, six hundred forty-four".