6405136553 has 2 divisors, whose sum is σ = 6405136554. Its totient is φ = 6405136552.

The previous prime is 6405136511. The next prime is 6405136601. The reversal of 6405136553 is 3556315046.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4147746409 + 2257390144 = 64403^2 + 47512^2 .

It is a cyclic number.

It is not a de Polignac number, because 6405136553 - 2¹⁶ = 6405071017 is a prime.

It is not a weakly prime, because it can be changed into another prime (6405136253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3202568276 + 3202568277.

It is an arithmetic number, because the mean of its divisors is an integer number (3202568277).

Almost surely, 2^6405136553 is an apocalyptic number.

It is an amenable number.

6405136553 is a deficient number, since it is larger than the sum of its proper divisors (1).

6405136553 is an equidigital number, since it uses as much as digits as its factorization.

6405136553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 38.

The square root of 6405136553 is about 80032.0970173842. The cubic root of 6405136553 is about 1857.1321041020.

The spelling of 6405136553 in words is "six billion, four hundred five million, one hundred thirty-six thousand, five hundred fifty-three".