18417224993 has 2 divisors, whose sum is σ = 18417224994. Its totient is φ = 18417224992.

The previous prime is 18417224957. The next prime is 18417225007. The reversal of 18417224993 is 39942271481.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15552085264 + 2865139729 = 124708^2 + 53527^2 .

It is a cyclic number.

It is not a de Polignac number, because 18417224993 - 2⁶ = 18417224929 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (18417224933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9208612496 + 9208612497.

It is an arithmetic number, because the mean of its divisors is an integer number (9208612497).

Almost surely, 2^18417224993 is an apocalyptic number.

It is an amenable number.

18417224993 is a deficient number, since it is larger than the sum of its proper divisors (1).

18417224993 is an equidigital number, since it uses as much as digits as its factorization.

18417224993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 50.

The spelling of 18417224993 in words is "eighteen billion, four hundred seventeen million, two hundred twenty-four thousand, nine hundred ninety-three".