18215239423 has 2 divisors, whose sum is σ = 18215239424. Its totient is φ = 18215239422.

The previous prime is 18215239403. The next prime is 18215239433. The reversal of 18215239423 is 32493251281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18215239423 - 2⁹ = 18215238911 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18215239403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9107619711 + 9107619712.

It is an arithmetic number, because the mean of its divisors is an integer number (9107619712).

Almost surely, 2^18215239423 is an apocalyptic number.

18215239423 is a deficient number, since it is larger than the sum of its proper divisors (1).

18215239423 is an equidigital number, since it uses as much as digits as its factorization.

18215239423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 40.

The spelling of 18215239423 in words is "eighteen billion, two hundred fifteen million, two hundred thirty-nine thousand, four hundred twenty-three".