646315633 has 2 divisors, whose sum is σ = 646315634. Its totient is φ = 646315632.

The previous prime is 646315613. The next prime is 646315687. The reversal of 646315633 is 336513646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 493372944 + 152942689 = 22212^2 + 12367^2 .

It is a cyclic number.

It is not a de Polignac number, because 646315633 - 2⁵ = 646315601 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646315592 and 646315601.

It is not a weakly prime, because it can be changed into another prime (646315613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323157816 + 323157817.

It is an arithmetic number, because the mean of its divisors is an integer number (323157817).

Almost surely, 2^646315633 is an apocalyptic number.

It is an amenable number.

646315633 is a deficient number, since it is larger than the sum of its proper divisors (1).

646315633 is an equidigital number, since it uses as much as digits as its factorization.

646315633 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 37.

The square root of 646315633 is about 25422.7385031589. The cubic root of 646315633 is about 864.5993145735.

The spelling of 646315633 in words is "six hundred forty-six million, three hundred fifteen thousand, six hundred thirty-three".