79218694656 has 400 divisors, whose sum is σ = 251542900224. Its totient is φ = 24765751296.

The previous prime is 79218694651. The next prime is 79218694657. The reversal of 79218694656 is 65649681297.

79218694656 is a `hidden beast` number, since 7 + 92 + 1 + 86 + 9 + 465 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 79218694593 and 79218694602.

It is not an unprimeable number, because it can be changed into a prime (79218694651) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 50553585 + ... + 50555151.

Almost surely, 2^79218694656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 79218694656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125771450112).

79218694656 is an abundant number, since it is smaller than the sum of its proper divisors (172324205568).

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

79218694656 is a wasteful number, since it uses less digits than its factorization.

79218694656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673 (or 1648 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 63.

The spelling of 79218694656 in words is "seventy-nine billion, two hundred eighteen million, six hundred ninety-four thousand, six hundred fifty-six".