18181247040 has 1120 divisors, whose sum is σ = 77750627328. Its totient is φ = 4014489600.

The previous prime is 18181247033. The next prime is 18181247083. The reversal of 18181247040 is 4074218181.

18181247040 is a `hidden beast` number, since 1 + 8 + 181 + 2 + 470 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18181246986 and 18181247004.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 586491825 + ... + 586491855.

Almost surely, 2^18181247040 is an apocalyptic number.

18181247040 is a gapful number since it is divisible by the number (10) 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 18181247040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38875313664).

18181247040 is an abundant number, since it is smaller than the sum of its proper divisors (59569380288).

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

18181247040 is a wasteful number, since it uses less digits than its factorization.

18181247040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110 (or 69 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The spelling of 18181247040 in words is "eighteen billion, one hundred eighty-one million, two hundred forty-seven thousand, forty".