18023994293 has 2 divisors, whose sum is σ = 18023994294. Its totient is φ = 18023994292.

The previous prime is 18023994281. The next prime is 18023994319. The reversal of 18023994293 is 39249932081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10645699684 + 7378294609 = 103178^2 + 85897^2 .

It is a cyclic number.

It is not a de Polignac number, because 18023994293 - 2⁴ = 18023994277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18073994293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9011997146 + 9011997147.

It is an arithmetic number, because the mean of its divisors is an integer number (9011997147).

Almost surely, 2^18023994293 is an apocalyptic number.

It is an amenable number.

18023994293 is a deficient number, since it is larger than the sum of its proper divisors (1).

18023994293 is an equidigital number, since it uses as much as digits as its factorization.

18023994293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 839808, while the sum is 50.

The spelling of 18023994293 in words is "eighteen billion, twenty-three million, nine hundred ninety-four thousand, two hundred ninety-three".