18394867137 has 4 divisors (see below), whose sum is σ = 24526489520. Its totient is φ = 12263244756.

The previous prime is 18394867133. The next prime is 18394867147. The reversal of 18394867137 is 73176849381.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18394867137 - 2² = 18394867133 is a prime.

It is a super-2 number, since 2×18394867137² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18394867133) 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, 3065811187 + ... + 3065811192.

It is an arithmetic number, because the mean of its divisors is an integer number (6131622380).

Almost surely, 2^18394867137 is an apocalyptic number.

It is an amenable number.

18394867137 is a deficient number, since it is larger than the sum of its proper divisors (6131622383).

18394867137 is an equidigital number, since it uses as much as digits as its factorization.

18394867137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6131622382.

The product of its digits is 6096384, while the sum is 57.

The spelling of 18394867137 in words is "eighteen billion, three hundred ninety-four million, eight hundred sixty-seven thousand, one hundred thirty-seven".