18581442780 has 96 divisors (see below), whose sum is σ = 54719981568. Its totient is φ = 4704710400.

The previous prime is 18581442769. The next prime is 18581442821. The reversal of 18581442780 is 8724418581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4335 + ... + 192825.

It is an arithmetic number, because the mean of its divisors is an integer number (569999808).

Almost surely, 2^18581442780 is an apocalyptic number.

18581442780 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 18581442780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27359990784).

18581442780 is an abundant number, since it is smaller than the sum of its proper divisors (36138538788).

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

18581442780 is a wasteful number, since it uses less digits than its factorization.

18581442780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188587 (or 188585 counting only the distinct ones).

The product of its (nonzero) digits is 573440, while the sum is 48.

The spelling of 18581442780 in words is "eighteen billion, five hundred eighty-one million, four hundred forty-two thousand, seven hundred eighty".