646625593 has 2 divisors, whose sum is σ = 646625594. Its totient is φ = 646625592.

The previous prime is 646625569. The next prime is 646625627. The reversal of 646625593 is 395526646.

646625593 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 645007609 + 1617984 = 25397^2 + 1272^2 .

It is a cyclic number.

It is not a de Polignac number, because 646625593 - 2¹⁷ = 646494521 is a prime.

It is not a weakly prime, because it can be changed into another prime (646625513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323312796 + 323312797.

It is an arithmetic number, because the mean of its divisors is an integer number (323312797).

Almost surely, 2^646625593 is an apocalyptic number.

It is an amenable number.

646625593 is a deficient number, since it is larger than the sum of its proper divisors (1).

646625593 is an equidigital number, since it uses as much as digits as its factorization.

646625593 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 46.

The square root of 646625593 is about 25428.8338898975. The cubic root of 646625593 is about 864.7375073079.

The spelling of 646625593 in words is "six hundred forty-six million, six hundred twenty-five thousand, five hundred ninety-three".