18195298139 has 4 divisors (see below), whose sum is σ = 18237515040. Its totient is φ = 18153081240.

The previous prime is 18195298133. The next prime is 18195298153. The reversal of 18195298139 is 93189259181.

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 18195298139 - 2¹⁶ = 18195232603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18195298133) 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, 21107804 + ... + 21108665.

It is an arithmetic number, because the mean of its divisors is an integer number (4559378760).

Almost surely, 2^18195298139 is an apocalyptic number.

18195298139 is a deficient number, since it is larger than the sum of its proper divisors (42216901).

18195298139 is an equidigital number, since it uses as much as digits as its factorization.

18195298139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42216900.

The product of its digits is 1399680, while the sum is 56.

The spelling of 18195298139 in words is "eighteen billion, one hundred ninety-five million, two hundred ninety-eight thousand, one hundred thirty-nine".