18851288149 has 2 divisors, whose sum is σ = 18851288150. Its totient is φ = 18851288148.

The previous prime is 18851288111. The next prime is 18851288189. The reversal of 18851288149 is 94188215881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17957876049 + 893412100 = 134007^2 + 29890^2 .

It is a cyclic number.

It is not a de Polignac number, because 18851288149 - 2¹¹ = 18851286101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18851288149.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18851288189) 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, 9425644074 + 9425644075.

It is an arithmetic number, because the mean of its divisors is an integer number (9425644075).

Almost surely, 2^18851288149 is an apocalyptic number.

It is an amenable number.

18851288149 is a deficient number, since it is larger than the sum of its proper divisors (1).

18851288149 is an equidigital number, since it uses as much as digits as its factorization.

18851288149 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1474560, while the sum is 55.

The spelling of 18851288149 in words is "eighteen billion, eight hundred fifty-one million, two hundred eighty-eight thousand, one hundred forty-nine".