18251331863 has 2 divisors, whose sum is σ = 18251331864. Its totient is φ = 18251331862.

The previous prime is 18251331793. The next prime is 18251331881. The reversal of 18251331863 is 36813315281.

It is a strong prime.

It is an emirp because it is prime and its reverse (36813315281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18251331863 - 2¹² = 18251327767 is a prime.

It is a super-2 number, since 2×18251331863² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18251331863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18251331893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9125665931 + 9125665932.

It is an arithmetic number, because the mean of its divisors is an integer number (9125665932).

Almost surely, 2^18251331863 is an apocalyptic number.

18251331863 is a deficient number, since it is larger than the sum of its proper divisors (1).

18251331863 is an equidigital number, since it uses as much as digits as its factorization.

18251331863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 103680, while the sum is 41.

The spelling of 18251331863 in words is "eighteen billion, two hundred fifty-one million, three hundred thirty-one thousand, eight hundred sixty-three".