646006657 has 2 divisors, whose sum is σ = 646006658. Its totient is φ = 646006656.

The previous prime is 646006577. The next prime is 646006661. The reversal of 646006657 is 756600646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645617281 + 389376 = 25409^2 + 624^2 .

It is a cyclic number.

It is not a de Polignac number, because 646006657 - 2²³ = 637618049 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (646006687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323003328 + 323003329.

It is an arithmetic number, because the mean of its divisors is an integer number (323003329).

Almost surely, 2^646006657 is an apocalyptic number.

It is an amenable number.

646006657 is a deficient number, since it is larger than the sum of its proper divisors (1).

646006657 is an equidigital number, since it uses as much as digits as its factorization.

646006657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 646006657 is about 25416.6610120212. The cubic root of 646006657 is about 864.4615165663.

The spelling of 646006657 in words is "six hundred forty-six million, six thousand, six hundred fifty-seven".