18540615520 has 96 divisors (see below), whose sum is σ = 50425478208. Its totient is φ = 6310330368.

The previous prime is 18540615517. The next prime is 18540615521. The reversal of 18540615520 is 2551604581.

It is a self number, because there is not a number n which added to its sum of digits gives 18540615520.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18540615521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93024 + ... + 213856.

It is an arithmetic number, because the mean of its divisors is an integer number (525265398).

Almost surely, 2^18540615520 is an apocalyptic number.

18540615520 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 18540615520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25212739104).

18540615520 is an abundant number, since it is smaller than the sum of its proper divisors (31884862688).

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

18540615520 is a wasteful number, since it uses less digits than its factorization.

18540615520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120992 (or 120984 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 37.

It can be divided in two parts, 1854061 and 5520, that added together give a palindrome (1859581).

The spelling of 18540615520 in words is "eighteen billion, five hundred forty million, six hundred fifteen thousand, five hundred twenty".