18390181056 has 224 divisors, whose sum is σ = 54442644480. Its totient is φ = 5442207744.

The previous prime is 18390181049. The next prime is 18390181067. The reversal of 18390181056 is 65018109381.

It is a super-2 number, since 2×18390181056² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18390180999 and 18390181017.

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, 6920080 + ... + 6922736.

It is an arithmetic number, because the mean of its divisors is an integer number (243047520).

Almost surely, 2^18390181056 is an apocalyptic number.

18390181056 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 18390181056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27221322240).

18390181056 is an abundant number, since it is smaller than the sum of its proper divisors (36052463424).

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

18390181056 is a wasteful number, since it uses less digits than its factorization.

18390181056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2791 (or 2781 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 42.

The spelling of 18390181056 in words is "eighteen billion, three hundred ninety million, one hundred eighty-one thousand, fifty-six".