18432242993 has 2 divisors, whose sum is σ = 18432242994. Its totient is φ = 18432242992.

The previous prime is 18432242951. The next prime is 18432242999. The reversal of 18432242993 is 39924223481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18407162929 + 25080064 = 135673^2 + 5008^2 .

It is a cyclic number.

It is not a de Polignac number, because 18432242993 - 2¹⁸ = 18431980849 is a prime.

It is not a weakly prime, because it can be changed into another prime (18432242999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9216121496 + 9216121497.

It is an arithmetic number, because the mean of its divisors is an integer number (9216121497).

Almost surely, 2^18432242993 is an apocalyptic number.

It is an amenable number.

18432242993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18432242993 is an equidigital number, since it uses as much as digits as its factorization.

18432242993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 746496, while the sum is 47.

The spelling of 18432242993 in words is "eighteen billion, four hundred thirty-two million, two hundred forty-two thousand, nine hundred ninety-three".