18750745891 has 2 divisors, whose sum is σ = 18750745892. Its totient is φ = 18750745890.

The previous prime is 18750745889. The next prime is 18750745933. The reversal of 18750745891 is 19854705781.

It is a weak prime.

It is an emirp because it is prime and its reverse (19854705781) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18750745891 - 2¹ = 18750745889 is a prime.

Together with 18750745889, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18750745831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9375372945 + 9375372946.

It is an arithmetic number, because the mean of its divisors is an integer number (9375372946).

Almost surely, 2^18750745891 is an apocalyptic number.

18750745891 is a deficient number, since it is larger than the sum of its proper divisors (1).

18750745891 is an equidigital number, since it uses as much as digits as its factorization.

18750745891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2822400, while the sum is 55.

The spelling of 18750745891 in words is "eighteen billion, seven hundred fifty million, seven hundred forty-five thousand, eight hundred ninety-one".