18539918279 has 2 divisors, whose sum is σ = 18539918280. Its totient is φ = 18539918278.

The previous prime is 18539918263. The next prime is 18539918297. The reversal of 18539918279 is 97281993581.

Together with next prime (18539918297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is an emirp because it is prime and its reverse (97281993581) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18539918279 - 2⁴ = 18539918263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18539918209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9269959139 + 9269959140.

It is an arithmetic number, because the mean of its divisors is an integer number (9269959140).

Almost surely, 2^18539918279 is an apocalyptic number.

18539918279 is a deficient number, since it is larger than the sum of its proper divisors (1).

18539918279 is an equidigital number, since it uses as much as digits as its factorization.

18539918279 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9797760, while the sum is 62.

The spelling of 18539918279 in words is "eighteen billion, five hundred thirty-nine million, nine hundred eighteen thousand, two hundred seventy-nine".