78961120664 has 16 divisors (see below), whose sum is σ = 155844317400. Its totient is φ = 37402636032.

The previous prime is 78961120657. The next prime is 78961120673. The reversal of 78961120664 is 46602116987.

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, 259740377 + ... + 259740680.

Almost surely, 2^78961120664 is an apocalyptic number.

It is an amenable number.

78961120664 is a deficient number, since it is larger than the sum of its proper divisors (76883196736).

78961120664 is a wasteful number, since it uses less digits than its factorization.

78961120664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519481082 (or 519481078 counting only the distinct ones).

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

The spelling of 78961120664 in words is "seventy-eight billion, nine hundred sixty-one million, one hundred twenty thousand, six hundred sixty-four".