18774393456 has 320 divisors, whose sum is σ = 61235191808. Its totient is φ = 4825350144.

The previous prime is 18774393437. The next prime is 18774393457. The reversal of 18774393456 is 65439347781.

It is a junction number, because it is equal to n+sod(n) for n = 18774393396 and 18774393405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18774393457) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 30929505 + ... + 30930111.

Almost surely, 2^18774393456 is an apocalyptic number.

18774393456 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 18774393456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30617595904).

18774393456 is an abundant number, since it is smaller than the sum of its proper divisors (42460798352).

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

18774393456 is a wasteful number, since it uses less digits than its factorization.

18774393456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808 (or 802 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 57.

The spelling of 18774393456 in words is "eighteen billion, seven hundred seventy-four million, three hundred ninety-three thousand, four hundred fifty-six".