18536999537 has 24 divisors (see below), whose sum is σ = 22274760960. Its totient is φ = 15365458080.

The previous prime is 18536999513. The next prime is 18536999567. The reversal of 18536999537 is 73599963581.

It is a de Polignac number, because none of the positive numbers 2^k-18536999537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18536999567) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2711039 + ... + 2717867.

It is an arithmetic number, because the mean of its divisors is an integer number (928115040).

Almost surely, 2^18536999537 is an apocalyptic number.

It is an amenable number.

18536999537 is a deficient number, since it is larger than the sum of its proper divisors (3737761423).

18536999537 is a wasteful number, since it uses less digits than its factorization.

18536999537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8661 (or 8654 counting only the distinct ones).

The product of its digits is 55112400, while the sum is 65.

The spelling of 18536999537 in words is "eighteen billion, five hundred thirty-six million, nine hundred ninety-nine thousand, five hundred thirty-seven".