18618545680 has 60 divisors (see below), whose sum is σ = 50355577260. Its totient is φ = 6383500032.

The previous prime is 18618545651. The next prime is 18618545681. The reversal of 18618545680 is 8654581681.

It can be written as a sum of positive squares in 2 ways, for example, as 2551462144 + 16067083536 = 50512^2 + 126756^2 .

It is not an unprimeable number, because it can be changed into a prime (18618545681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2370895 + ... + 2378734.

It is an arithmetic number, because the mean of its divisors is an integer number (839259621).

Almost surely, 2^18618545680 is an apocalyptic number.

18618545680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18618545680 is an abundant number, since it is smaller than the sum of its proper divisors (31737031580).

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

18618545680 is a wasteful number, since it uses less digits than its factorization.

18618545680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4749656 (or 4749643 counting only the distinct ones).

The product of its (nonzero) digits is 1843200, while the sum is 52.

It can be divided in two parts, 18618545 and 680, that added together give a square (18619225 = 4315²).

The spelling of 18618545680 in words is "eighteen billion, six hundred eighteen million, five hundred forty-five thousand, six hundred eighty".