6405263401 has 2 divisors, whose sum is σ = 6405263402. Its totient is φ = 6405263400.

The previous prime is 6405263377. The next prime is 6405263407. The reversal of 6405263401 is 1043625046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4131404176 + 2273859225 = 64276^2 + 47685^2 .

It is a cyclic number.

It is not a de Polignac number, because 6405263401 - 2⁹ = 6405262889 is a prime.

It is not a weakly prime, because it can be changed into another prime (6405263407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202631700 + 3202631701.

It is an arithmetic number, because the mean of its divisors is an integer number (3202631701).

Almost surely, 2^6405263401 is an apocalyptic number.

It is an amenable number.

6405263401 is a deficient number, since it is larger than the sum of its proper divisors (1).

6405263401 is an equidigital number, since it uses as much as digits as its factorization.

6405263401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 6405263401 is about 80032.8894955068. The cubic root of 6405263401 is about 1857.1443636344.

Adding to 6405263401 its reverse (1043625046), we get a palindrome (7448888447).

The spelling of 6405263401 in words is "six billion, four hundred five million, two hundred sixty-three thousand, four hundred one".