18417241889 has 2 divisors, whose sum is σ = 18417241890. Its totient is φ = 18417241888.

The previous prime is 18417241849. The next prime is 18417241919. The reversal of 18417241889 is 98814271481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13062661264 + 5354580625 = 114292^2 + 73175^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18417241889 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18417241889.

It is not a weakly prime, because it can be changed into another prime (18417241849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9208620944 + 9208620945.

It is an arithmetic number, because the mean of its divisors is an integer number (9208620945).

Almost surely, 2^18417241889 is an apocalyptic number.

It is an amenable number.

18417241889 is a deficient number, since it is larger than the sum of its proper divisors (1).

18417241889 is an equidigital number, since it uses as much as digits as its factorization.

18417241889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1032192, while the sum is 53.

The spelling of 18417241889 in words is "eighteen billion, four hundred seventeen million, two hundred forty-one thousand, eight hundred eighty-nine".