18536437939 has 4 divisors (see below), whose sum is σ = 18546563440. Its totient is φ = 18526312440.

The previous prime is 18536437921. The next prime is 18536437949. The reversal of 18536437939 is 93973463581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93973463581 = 31 ⋅3031402051.

It is a cyclic number.

It is not a de Polignac number, because 18536437939 - 2⁷ = 18536437811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18536437919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5060004 + ... + 5063665.

It is an arithmetic number, because the mean of its divisors is an integer number (4636640860).

Almost surely, 2^18536437939 is an apocalyptic number.

18536437939 is a deficient number, since it is larger than the sum of its proper divisors (10125501).

18536437939 is a wasteful number, since it uses less digits than its factorization.

18536437939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10125500.

The product of its digits is 14696640, while the sum is 58.

The spelling of 18536437939 in words is "eighteen billion, five hundred thirty-six million, four hundred thirty-seven thousand, nine hundred thirty-nine".