79905911640 has 64 divisors (see below), whose sum is σ = 242091214560. Its totient is φ = 21097267200.

The previous prime is 79905911623. The next prime is 79905911653. The reversal of 79905911640 is 4611950997.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3284329 + ... + 3308568.

Almost surely, 2^79905911640 is an apocalyptic number.

It is an amenable number.

79905911640 is an abundant number, since it is smaller than the sum of its proper divisors (162185302920).

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

79905911640 is a wasteful number, since it uses less digits than its factorization.

79905911640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6593012 (or 6593008 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 51.

The spelling of 79905911640 in words is "seventy-nine billion, nine hundred five million, nine hundred eleven thousand, six hundred forty".