18775238233 has 2 divisors, whose sum is σ = 18775238234. Its totient is φ = 18775238232.

The previous prime is 18775238219. The next prime is 18775238267. The reversal of 18775238233 is 33283257781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11663352009 + 7111886224 = 107997^2 + 84332^2 .

It is a cyclic number.

It is not a de Polignac number, because 18775238233 - 2²¹ = 18773141081 is a prime.

It is not a weakly prime, because it can be changed into another prime (18775238333) 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, 9387619116 + 9387619117.

It is an arithmetic number, because the mean of its divisors is an integer number (9387619117).

Almost surely, 2^18775238233 is an apocalyptic number.

It is an amenable number.

18775238233 is a deficient number, since it is larger than the sum of its proper divisors (1).

18775238233 is an equidigital number, since it uses as much as digits as its factorization.

18775238233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 49.

The spelling of 18775238233 in words is "eighteen billion, seven hundred seventy-five million, two hundred thirty-eight thousand, two hundred thirty-three".