18890400233 has 2 divisors, whose sum is σ = 18890400234. Its totient is φ = 18890400232.

The previous prime is 18890400203. The next prime is 18890400239. The reversal of 18890400233 is 33200409881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15828659344 + 3061740889 = 125812^2 + 55333^2 .

It is a cyclic number.

It is not a de Polignac number, because 18890400233 - 2¹⁴ = 18890383849 is a prime.

It is not a weakly prime, because it can be changed into another prime (18890400239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9445200116 + 9445200117.

It is an arithmetic number, because the mean of its divisors is an integer number (9445200117).

Almost surely, 2^18890400233 is an apocalyptic number.

It is an amenable number.

18890400233 is a deficient number, since it is larger than the sum of its proper divisors (1).

18890400233 is an equidigital number, since it uses as much as digits as its factorization.

18890400233 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 38.

The spelling of 18890400233 in words is "eighteen billion, eight hundred ninety million, four hundred thousand, two hundred thirty-three".