18250891447 has 2 divisors, whose sum is σ = 18250891448. Its totient is φ = 18250891446.

The previous prime is 18250891441. The next prime is 18250891471. The reversal of 18250891447 is 74419805281.

It is a weak prime.

It is an emirp because it is prime and its reverse (74419805281) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18250891447 is a prime.

It is a super-2 number, since 2×18250891447² (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 18250891447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18250891441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9125445723 + 9125445724.

It is an arithmetic number, because the mean of its divisors is an integer number (9125445724).

Almost surely, 2^18250891447 is an apocalyptic number.

18250891447 is a deficient number, since it is larger than the sum of its proper divisors (1).

18250891447 is an equidigital number, since it uses as much as digits as its factorization.

18250891447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 645120, while the sum is 49.

The spelling of 18250891447 in words is "eighteen billion, two hundred fifty million, eight hundred ninety-one thousand, four hundred forty-seven".