79817971176640 has 28 divisors (see below), whose sum is σ = 190066543865136. Its totient is φ = 31927188470528.

The previous prime is 79817971176557. The next prime is 79817971176673. The reversal of 79817971176640 is 4667117971897.

It is a super-5 number, since 5×79817971176640⁵ (a number of 71 digits) contains 55555 as substring.

It is a Smith number, since the sum of its digits (73) coincides with the sum of the digits of its prime factors.

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, 124715579644 + ... + 124715580283.

Almost surely, 2^{79817971176640} is an apocalyptic number.

It is an amenable number.

79817971176640 is an abundant number, since it is smaller than the sum of its proper divisors (110248572688496).

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

79817971176640 is a wasteful number, since it uses less digits than its factorization.

79817971176640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249431159944 (or 249431159934 counting only the distinct ones).

The product of its (nonzero) digits is 224042112, while the sum is 73.

The spelling of 79817971176640 in words is "seventy-nine trillion, eight hundred seventeen billion, nine hundred seventy-one million, one hundred seventy-six thousand, six hundred forty".