18479878180 has 12 divisors (see below), whose sum is σ = 38807744220. Its totient is φ = 7391951264.

The previous prime is 18479878177. The next prime is 18479878181. The reversal of 18479878180 is 8187897481.

It can be written as a sum of positive squares in 2 ways, for example, as 6290393344 + 12189484836 = 79312^2 + 110406^2 .

It is a super-2 number, since 2×18479878180² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18479878181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461996935 + ... + 461996974.

It is an arithmetic number, because the mean of its divisors is an integer number (3233978685).

Almost surely, 2^18479878180 is an apocalyptic number.

18479878180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18479878180 is an abundant number, since it is smaller than the sum of its proper divisors (20327866040).

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

18479878180 is a wasteful number, since it uses less digits than its factorization.

18479878180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923993918 (or 923993916 counting only the distinct ones).

The product of its (nonzero) digits is 7225344, while the sum is 61.

The spelling of 18479878180 in words is "eighteen billion, four hundred seventy-nine million, eight hundred seventy-eight thousand, one hundred eighty".