18198542639 has 2 divisors, whose sum is σ = 18198542640. Its totient is φ = 18198542638.

The previous prime is 18198542629. The next prime is 18198542641. The reversal of 18198542639 is 93624589181.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18198542639 - 2¹² = 18198538543 is a prime.

Together with 18198542641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18198542629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9099271319 + 9099271320.

It is an arithmetic number, because the mean of its divisors is an integer number (9099271320).

Almost surely, 2^18198542639 is an apocalyptic number.

18198542639 is a deficient number, since it is larger than the sum of its proper divisors (1).

18198542639 is an equidigital number, since it uses as much as digits as its factorization.

18198542639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 56.

It can be divided in two parts, 18198542 and 639, that added together give a palindrome (18199181).

The spelling of 18198542639 in words is "eighteen billion, one hundred ninety-eight million, five hundred forty-two thousand, six hundred thirty-nine".