18254438856 has 128 divisors (see below), whose sum is σ = 52796620800. Its totient is φ = 5838912000.

The previous prime is 18254438843. The next prime is 18254438887. The reversal of 18254438856 is 65883445281.

18254438856 is a `hidden beast` number, since 1 + 8 + 254 + 4 + 388 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 523321 + ... + 557111.

It is an arithmetic number, because the mean of its divisors is an integer number (412473600).

Almost surely, 2^18254438856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18254438856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26398310400).

18254438856 is an abundant number, since it is smaller than the sum of its proper divisors (34542181944).

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

18254438856 is a wasteful number, since it uses less digits than its factorization.

18254438856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33908 (or 33898 counting only the distinct ones).

The product of its digits is 7372800, while the sum is 54.

The spelling of 18254438856 in words is "eighteen billion, two hundred fifty-four million, four hundred thirty-eight thousand, eight hundred fifty-six".