18285366493 has 2 divisors, whose sum is σ = 18285366494. Its totient is φ = 18285366492.

The previous prime is 18285366431. The next prime is 18285366499. The reversal of 18285366493 is 39466358281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9377404569 + 8907961924 = 96837^2 + 94382^2 .

It is a cyclic number.

It is not a de Polignac number, because 18285366493 - 2⁹ = 18285365981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18285366499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9142683246 + 9142683247.

It is an arithmetic number, because the mean of its divisors is an integer number (9142683247).

Almost surely, 2^18285366493 is an apocalyptic number.

It is an amenable number.

18285366493 is a deficient number, since it is larger than the sum of its proper divisors (1).

18285366493 is an equidigital number, since it uses as much as digits as its factorization.

18285366493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7464960, while the sum is 55.

The spelling of 18285366493 in words is "eighteen billion, two hundred eighty-five million, three hundred sixty-six thousand, four hundred ninety-three".