646704673 has 2 divisors, whose sum is σ = 646704674. Its totient is φ = 646704672.

The previous prime is 646704629. The next prime is 646704677. The reversal of 646704673 is 376407646.

646704673 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 472279824 + 174424849 = 21732^2 + 13207^2 .

It is a cyclic number.

It is not a de Polignac number, because 646704673 - 2¹³ = 646696481 is a prime.

It is not a weakly prime, because it can be changed into another prime (646704677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323352336 + 323352337.

It is an arithmetic number, because the mean of its divisors is an integer number (323352337).

Almost surely, 2^646704673 is an apocalyptic number.

It is an amenable number.

646704673 is a deficient number, since it is larger than the sum of its proper divisors (1).

646704673 is an equidigital number, since it uses as much as digits as its factorization.

646704673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 43.

The square root of 646704673 is about 25430.3887701309. The cubic root of 646704673 is about 864.7727573069.

The spelling of 646704673 in words is "six hundred forty-six million, seven hundred four thousand, six hundred seventy-three".