18558790778880 has 1440 divisors, whose sum is σ = 74633390657280. Its totient is φ = 4339170017280.

The previous prime is 18558790778863. The next prime is 18558790778903. The reversal of 18558790778880 is 8887709785581.

It is a tau number, because it is divible by the number of its divisors (1440).

It is a self number, because there is not a number n which added to its sum of digits gives 18558790778880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 20461731387 + ... + 20461732293.

It is an arithmetic number, because the mean of its divisors is an integer number (51828743512).

Almost surely, 2^{18558790778880} is an apocalyptic number.

18558790778880 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 18558790778880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37316695328640).

18558790778880 is an abundant number, since it is smaller than the sum of its proper divisors (56074599878400).

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

18558790778880 is an equidigital number, since it uses as much as digits as its factorization.

18558790778880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1018 (or 957 counting only the distinct ones).

The product of its (nonzero) digits is 2528870400, while the sum is 81.

The spelling of 18558790778880 in words is "eighteen trillion, five hundred fifty-eight billion, seven hundred ninety million, seven hundred seventy-eight thousand, eight hundred eighty".