646064933 has 2 divisors, whose sum is σ = 646064934. Its totient is φ = 646064932.

The previous prime is 646064873. The next prime is 646064941. The reversal of 646064933 is 339460646.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 453604804 + 192460129 = 21298^2 + 13873^2 .

It is a cyclic number.

It is not a de Polignac number, because 646064933 - 2⁸ = 646064677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646064953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323032466 + 323032467.

It is an arithmetic number, because the mean of its divisors is an integer number (323032467).

Almost surely, 2^646064933 is an apocalyptic number.

It is an amenable number.

646064933 is a deficient number, since it is larger than the sum of its proper divisors (1).

646064933 is an equidigital number, since it uses as much as digits as its factorization.

646064933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 41.

The square root of 646064933 is about 25417.8073995378. The cubic root of 646064933 is about 864.4875100263.

The spelling of 646064933 in words is "six hundred forty-six million, sixty-four thousand, nine hundred thirty-three".