18361615040 has 56 divisors (see below), whose sum is σ = 43845662880. Its totient is φ = 7324141568.

The previous prime is 18361615037. The next prime is 18361615049. The reversal of 18361615040 is 4051616381.

It is not an unprimeable number, because it can be changed into a prime (18361615049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34964 + ... + 194796.

Almost surely, 2^18361615040 is an apocalyptic number.

18361615040 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 18361615040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21922831440).

18361615040 is an abundant number, since it is smaller than the sum of its proper divisors (25484047840).

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

18361615040 is a wasteful number, since it uses less digits than its factorization.

18361615040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160209 (or 160199 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The spelling of 18361615040 in words is "eighteen billion, three hundred sixty-one million, six hundred fifteen thousand, forty".