6404625653 has 2 divisors, whose sum is σ = 6404625654. Its totient is φ = 6404625652.

The previous prime is 6404625649. The next prime is 6404625673. The reversal of 6404625653 is 3565264046.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4861157284 + 1543468369 = 69722^2 + 39287^2 .

It is a cyclic number.

It is not a de Polignac number, because 6404625653 - 2² = 6404625649 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6404625653.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6404625673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202312826 + 3202312827.

It is an arithmetic number, because the mean of its divisors is an integer number (3202312827).

Almost surely, 2^6404625653 is an apocalyptic number.

It is an amenable number.

6404625653 is a deficient number, since it is larger than the sum of its proper divisors (1).

6404625653 is an equidigital number, since it uses as much as digits as its factorization.

6404625653 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 518400, while the sum is 41.

The square root of 6404625653 is about 80028.9051093416. The cubic root of 6404625653 is about 1857.0827252942.

Adding to 6404625653 its reverse (3565264046), we get a palindrome (9969889699).

The spelling of 6404625653 in words is "six billion, four hundred four million, six hundred twenty-five thousand, six hundred fifty-three".