18885239856 has 320 divisors, whose sum is σ = 64692367360. Its totient is φ = 5162019840.

The previous prime is 18885239833. The next prime is 18885239899. The reversal of 18885239856 is 65893258881.

18885239856 is a `hidden beast` number, since 18 + 8 + 8 + 523 + 98 + 5 + 6 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 18885239793 and 18885239802.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6823785 + ... + 6826551.

It is an arithmetic number, because the mean of its divisors is an integer number (202163648).

Almost surely, 2^18885239856 is an apocalyptic number.

18885239856 is a gapful number since it is divisible by the number (16) 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 18885239856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32346183680).

18885239856 is an abundant number, since it is smaller than the sum of its proper divisors (45807127504).

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

18885239856 is a wasteful number, since it uses less digits than its factorization.

18885239856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2889 (or 2877 counting only the distinct ones).

The product of its digits is 33177600, while the sum is 63.

The spelling of 18885239856 in words is "eighteen billion, eight hundred eighty-five million, two hundred thirty-nine thousand, eight hundred fifty-six".