78659542180 has 24 divisors (see below), whose sum is σ = 165609695160. Its totient is φ = 31382929920.

The previous prime is 78659542109. The next prime is 78659542187. The reversal of 78659542180 is 8124595687.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 764964964 + 77894577216 = 27658^2 + 279096^2 .

It is not an unprimeable number, because it can be changed into a prime (78659542187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5047461 + ... + 5063020.

It is an arithmetic number, because the mean of its divisors is an integer number (6900403965).

Almost surely, 2^78659542180 is an apocalyptic number.

It is an amenable number.

78659542180 is an abundant number, since it is smaller than the sum of its proper divisors (86950152980).

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

78659542180 is a wasteful number, since it uses less digits than its factorization.

78659542180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10110879 (or 10110877 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 55.

The spelling of 78659542180 in words is "seventy-eight billion, six hundred fifty-nine million, five hundred forty-two thousand, one hundred eighty".