18445985856 has 63 divisors (see below), whose sum is σ = 52881432591. Its totient is φ = 6147575424.

The previous prime is 18445985851. The next prime is 18445985863. The reversal of 18445985856 is 65858954481.

The square root of 18445985856 is 135816.

It is a perfect power (a square), and thus also a powerful number.

18445985856 is a `hidden beast` number, since 1 + 8 + 4 + 45 + 9 + 8 + 585 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18445985793 and 18445985802.

It is not an unprimeable number, because it can be changed into a prime (18445985851) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3256755 + ... + 3262413.

Almost surely, 2^18445985856 is an apocalyptic number.

18445985856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18445985856 is the 135816-th square number.

It is an amenable number.

18445985856 is an abundant number, since it is smaller than the sum of its proper divisors (34435446735).

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

18445985856 is an frugal number, since it uses more digits than its factorization.

18445985856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11336 (or 5664 counting only the distinct ones).

The product of its digits is 55296000, while the sum is 63.

The spelling of 18445985856 in words is "eighteen billion, four hundred forty-five million, nine hundred eighty-five thousand, eight hundred fifty-six".