646136233 has 2 divisors, whose sum is σ = 646136234. Its totient is φ = 646136232.

The previous prime is 646136203. The next prime is 646136237. The reversal of 646136233 is 332631646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 331676944 + 314459289 = 18212^2 + 17733^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-646136233 is a prime.

It is not a weakly prime, because it can be changed into another prime (646136237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323068116 + 323068117.

It is an arithmetic number, because the mean of its divisors is an integer number (323068117).

Almost surely, 2^646136233 is an apocalyptic number.

It is an amenable number.

646136233 is a deficient number, since it is larger than the sum of its proper divisors (1).

646136233 is an equidigital number, since it uses as much as digits as its factorization.

646136233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 34.

The square root of 646136233 is about 25419.2099208453. The cubic root of 646136233 is about 864.5193105926.

Adding to 646136233 its reverse (332631646), we get a palindrome (978767879).

The spelling of 646136233 in words is "six hundred forty-six million, one hundred thirty-six thousand, two hundred thirty-three".