80009878656 has 128 divisors (see below), whose sum is σ = 218528798400. Its totient is φ = 25925971968.

The previous prime is 80009878643. The next prime is 80009878727. The reversal of 80009878656 is 65687890008.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 80009878596 and 80009878605.

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, 2200335 + ... + 2236401.

Almost surely, 2^80009878656 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 80009878656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109264399200).

80009878656 is an abundant number, since it is smaller than the sum of its proper divisors (138518919744).

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

80009878656 is a wasteful number, since it uses less digits than its factorization.

80009878656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36246 (or 36234 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 57.

The spelling of 80009878656 in words is "eighty billion, nine million, eight hundred seventy-eight thousand, six hundred fifty-six".