80689868656 has 80 divisors (see below), whose sum is σ = 165836484000. Its totient is φ = 37973505024.

The previous prime is 80689868621. The next prime is 80689868681. The reversal of 80689868656 is 65686898608.

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, 3850495 + ... + 3871393.

It is an arithmetic number, because the mean of its divisors is an integer number (2072956050).

Almost surely, 2^80689868656 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 80689868656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82918242000).

80689868656 is an abundant number, since it is smaller than the sum of its proper divisors (85146615344).

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

80689868656 is a wasteful number, since it uses less digits than its factorization.

80689868656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21146 (or 21140 counting only the distinct ones).

The product of its (nonzero) digits is 238878720, while the sum is 70.

The spelling of 80689868656 in words is "eighty billion, six hundred eighty-nine million, eight hundred sixty-eight thousand, six hundred fifty-six".