18851288227 has 2 divisors, whose sum is σ = 18851288228. Its totient is φ = 18851288226.

The previous prime is 18851288189. The next prime is 18851288231. The reversal of 18851288227 is 72288215881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18851288227 is a prime.

It is not a weakly prime, because it can be changed into another prime (18851288257) 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, 9425644113 + 9425644114.

It is an arithmetic number, because the mean of its divisors is an integer number (9425644114).

Almost surely, 2^18851288227 is an apocalyptic number.

18851288227 is a deficient number, since it is larger than the sum of its proper divisors (1).

18851288227 is an equidigital number, since it uses as much as digits as its factorization.

18851288227 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1146880, while the sum is 52.

The spelling of 18851288227 in words is "eighteen billion, eight hundred fifty-one million, two hundred eighty-eight thousand, two hundred twenty-seven".