18537338139 has 4 divisors (see below), whose sum is σ = 24716450856. Its totient is φ = 12358225424.

The previous prime is 18537338137. The next prime is 18537338161. The reversal of 18537338139 is 93183373581.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18537338139 - 2¹ = 18537338137 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18537338091 and 18537338100.

It is not an unprimeable number, because it can be changed into a prime (18537338137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3089556354 + ... + 3089556359.

It is an arithmetic number, because the mean of its divisors is an integer number (6179112714).

Almost surely, 2^18537338139 is an apocalyptic number.

18537338139 is a deficient number, since it is larger than the sum of its proper divisors (6179112717).

18537338139 is an equidigital number, since it uses as much as digits as its factorization.

18537338139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6179112716.

The product of its digits is 1632960, while the sum is 51.

The spelling of 18537338139 in words is "eighteen billion, five hundred thirty-seven million, three hundred thirty-eight thousand, one hundred thirty-nine".