18634739243 has 2 divisors, whose sum is σ = 18634739244. Its totient is φ = 18634739242.

The previous prime is 18634739213. The next prime is 18634739257. The reversal of 18634739243 is 34293743681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18634739243 - 2⁸ = 18634738987 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18634739191 and 18634739200.

It is not a weakly prime, because it can be changed into another prime (18634739213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9317369621 + 9317369622.

It is an arithmetic number, because the mean of its divisors is an integer number (9317369622).

Almost surely, 2^18634739243 is an apocalyptic number.

18634739243 is a deficient number, since it is larger than the sum of its proper divisors (1).

18634739243 is an equidigital number, since it uses as much as digits as its factorization.

18634739243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2612736, while the sum is 50.

The spelling of 18634739243 in words is "eighteen billion, six hundred thirty-four million, seven hundred thirty-nine thousand, two hundred forty-three".