18278909323 has 2 divisors, whose sum is σ = 18278909324. Its totient is φ = 18278909322.

The previous prime is 18278909287. The next prime is 18278909339. The reversal of 18278909323 is 32390987281.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18278909323 - 2²⁹ = 17742038411 is a prime.

It is not a weakly prime, because it can be changed into another prime (18278909353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9139454661 + 9139454662.

It is an arithmetic number, because the mean of its divisors is an integer number (9139454662).

Almost surely, 2^18278909323 is an apocalyptic number.

18278909323 is a deficient number, since it is larger than the sum of its proper divisors (1).

18278909323 is an equidigital number, since it uses as much as digits as its factorization.

18278909323 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 52.

The spelling of 18278909323 in words is "eighteen billion, two hundred seventy-eight million, nine hundred nine thousand, three hundred twenty-three".