18513505080 has 192 divisors, whose sum is σ = 68851074240. Its totient is φ = 4226328576.

The previous prime is 18513505033. The next prime is 18513505081. The reversal of 18513505080 is 8050531581.

18513505080 is a `hidden beast` number, since 18 + 5 + 135 + 0 + 508 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18513505081) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2205852 + ... + 2214228.

It is an arithmetic number, because the mean of its divisors is an integer number (358599345).

Almost surely, 2^18513505080 is an apocalyptic number.

18513505080 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 18513505080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34425537120).

18513505080 is an abundant number, since it is smaller than the sum of its proper divisors (50337569160).

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

18513505080 is a wasteful number, since it uses less digits than its factorization.

18513505080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9278 (or 9271 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 36.

The spelling of 18513505080 in words is "eighteen billion, five hundred thirteen million, five hundred five thousand, eighty".