646250557 has 2 divisors, whose sum is σ = 646250558. Its totient is φ = 646250556.

The previous prime is 646250551. The next prime is 646250567. The reversal of 646250557 is 755052646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 375351876 + 270898681 = 19374^2 + 16459^2 .

It is a cyclic number.

It is not a de Polignac number, because 646250557 - 2¹⁹ = 645726269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646250551) 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, 323125278 + 323125279.

It is an arithmetic number, because the mean of its divisors is an integer number (323125279).

Almost surely, 2^646250557 is an apocalyptic number.

It is an amenable number.

646250557 is a deficient number, since it is larger than the sum of its proper divisors (1).

646250557 is an equidigital number, since it uses as much as digits as its factorization.

646250557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252000, while the sum is 40.

The square root of 646250557 is about 25421.4585930863. The cubic root of 646250557 is about 864.5702954428.

The spelling of 646250557 in words is "six hundred forty-six million, two hundred fifty thousand, five hundred fifty-seven".