18187057980 has 1152 divisors, whose sum is σ = 77667932160. Its totient is φ = 3463741440.

The previous prime is 18187057969. The next prime is 18187058027. The reversal of 18187057980 is 8975078181.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 308255191 + ... + 308255249.

It is an arithmetic number, because the mean of its divisors is an integer number (67420080).

Almost surely, 2^18187057980 is an apocalyptic number.

18187057980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18187057980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38833966080).

18187057980 is an abundant number, since it is smaller than the sum of its proper divisors (59480874180).

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

18187057980 is a wasteful number, since it uses less digits than its factorization.

18187057980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 54.

The spelling of 18187057980 in words is "eighteen billion, one hundred eighty-seven million, fifty-seven thousand, nine hundred eighty".