18157440730 has 128 divisors (see below), whose sum is σ = 38976215040. Its totient is φ = 6003728640.

The previous prime is 18157440701. The next prime is 18157440731. The reversal of 18157440730 is 3704475181.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18157440731) 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, 33194317 + ... + 33194863.

It is an arithmetic number, because the mean of its divisors is an integer number (304501680).

Almost surely, 2^18157440730 is an apocalyptic number.

18157440730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18157440730 is an abundant number, since it is smaller than the sum of its proper divisors (20818774310).

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

18157440730 is a wasteful number, since it uses less digits than its factorization.

18157440730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884.

The product of its (nonzero) digits is 94080, while the sum is 40.

The spelling of 18157440730 in words is "eighteen billion, one hundred fifty-seven million, four hundred forty thousand, seven hundred thirty".