18278909339 has 2 divisors, whose sum is σ = 18278909340. Its totient is φ = 18278909338.

The previous prime is 18278909323. The next prime is 18278909353. The reversal of 18278909339 is 93390987281.

It is a strong prime.

It is an emirp because it is prime and its reverse (93390987281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18278909339 - 2⁴ = 18278909323 is a prime.

It is not a weakly prime, because it can be changed into another prime (18278909939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9139454669 + 9139454670.

It is an arithmetic number, because the mean of its divisors is an integer number (9139454670).

Almost surely, 2^18278909339 is an apocalyptic number.

18278909339 is a deficient number, since it is larger than the sum of its proper divisors (1).

18278909339 is an equidigital number, since it uses as much as digits as its factorization.

18278909339 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5878656, while the sum is 59.

The spelling of 18278909339 in words is "eighteen billion, two hundred seventy-eight million, nine hundred nine thousand, three hundred thirty-nine".