18421560456 has 32 divisors (see below), whose sum is σ = 49596509760. Its totient is φ = 5668172352.

The previous prime is 18421560433. The next prime is 18421560491. The reversal of 18421560456 is 65406512481.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 29521420 + ... + 29522043.

It is an arithmetic number, because the mean of its divisors is an integer number (1549890930).

Almost surely, 2^18421560456 is an apocalyptic number.

It is an amenable number.

18421560456 is an abundant number, since it is smaller than the sum of its proper divisors (31174949304).

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

18421560456 is a wasteful number, since it uses less digits than its factorization.

18421560456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59043485 (or 59043481 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 18421560456 in words is "eighteen billion, four hundred twenty-one million, five hundred sixty thousand, four hundred fifty-six".