646231818233 has 2 divisors, whose sum is σ = 646231818234. Its totient is φ = 646231818232.

The previous prime is 646231818223. The next prime is 646231818241. The reversal of 646231818233 is 332818132646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 631821496384 + 14410321849 = 794872^2 + 120043^2 .

It is a cyclic number.

It is not a de Polignac number, because 646231818233 - 2³⁴ = 629051949049 is a prime.

It is not a weakly prime, because it can be changed into another prime (646231818223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323115909116 + 323115909117.

It is an arithmetic number, because the mean of its divisors is an integer number (323115909117).

Almost surely, 2^646231818233 is an apocalyptic number.

It is an amenable number.

646231818233 is a deficient number, since it is larger than the sum of its proper divisors (1).

646231818233 is an equidigital number, since it uses as much as digits as its factorization.

646231818233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 995328, while the sum is 47.

The spelling of 646231818233 in words is "six hundred forty-six billion, two hundred thirty-one million, eight hundred eighteen thousand, two hundred thirty-three".