18157433538 has 32 divisors (see below), whose sum is σ = 36554229504. Its totient is φ = 6012701072.

The previous prime is 18157433537. The next prime is 18157433561. The reversal of 18157433538 is 83533475181.

It is not an unprimeable number, because it can be changed into a prime (18157433533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 621781 + ... + 650327.

It is an arithmetic number, because the mean of its divisors is an integer number (1142319672).

Almost surely, 2^18157433538 is an apocalyptic number.

18157433538 is an abundant number, since it is smaller than the sum of its proper divisors (18396795966).

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

18157433538 is a wasteful number, since it uses less digits than its factorization.

18157433538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29246.

The product of its digits is 1209600, while the sum is 48.

The spelling of 18157433538 in words is "eighteen billion, one hundred fifty-seven million, four hundred thirty-three thousand, five hundred thirty-eight".