18850989233 has 2 divisors, whose sum is σ = 18850989234. Its totient is φ = 18850989232.

The previous prime is 18850989229. The next prime is 18850989247. The reversal of 18850989233 is 33298905881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18847720369 + 3268864 = 137287^2 + 1808^2 .

It is a cyclic number.

It is not a de Polignac number, because 18850989233 - 2² = 18850989229 is a prime.

It is not a weakly prime, because it can be changed into another prime (18850989203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9425494616 + 9425494617.

It is an arithmetic number, because the mean of its divisors is an integer number (9425494617).

Almost surely, 2^18850989233 is an apocalyptic number.

It is an amenable number.

18850989233 is a deficient number, since it is larger than the sum of its proper divisors (1).

18850989233 is an equidigital number, since it uses as much as digits as its factorization.

18850989233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3732480, while the sum is 56.

The spelling of 18850989233 in words is "eighteen billion, eight hundred fifty million, nine hundred eighty-nine thousand, two hundred thirty-three".