18255559680 has 616 divisors, whose sum is σ = 67550705232. Its totient is φ = 4729798656.

The previous prime is 18255559631. The next prime is 18255559681. The reversal of 18255559680 is 8695555281.

18255559680 is a `hidden beast` number, since 1 + 8 + 2 + 5 + 5 + 559 + 6 + 80 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18255559681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 250076124 + ... + 250076196.

Almost surely, 2^18255559680 is an apocalyptic number.

18255559680 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 18255559680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33775352616).

18255559680 is an abundant number, since it is smaller than the sum of its proper divisors (49295145552).

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

18255559680 is an frugal number, since it uses more digits than its factorization.

18255559680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183 (or 150 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 54.

The spelling of 18255559680 in words is "eighteen billion, two hundred fifty-five million, five hundred fifty-nine thousand, six hundred eighty".