6448326557 has 2 divisors, whose sum is σ = 6448326558. Its totient is φ = 6448326556.

The previous prime is 6448326553. The next prime is 6448326587. The reversal of 6448326557 is 7556238446.

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., 4253778841 + 2194547716 = 65221^2 + 46846^2 .

It is a cyclic number.

It is not a de Polignac number, because 6448326557 - 2² = 6448326553 is a prime.

It is a super-2 number, since 2×6448326557² = 83161830771422948498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6448326553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3224163278 + 3224163279.

It is an arithmetic number, because the mean of its divisors is an integer number (3224163279).

Almost surely, 2^6448326557 is an apocalyptic number.

It is an amenable number.

6448326557 is a deficient number, since it is larger than the sum of its proper divisors (1).

6448326557 is an equidigital number, since it uses as much as digits as its factorization.

6448326557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4838400, while the sum is 50.

The square root of 6448326557 is about 80301.4729441497. The cubic root of 6448326557 is about 1861.2969869620.

The spelling of 6448326557 in words is "six billion, four hundred forty-eight million, three hundred twenty-six thousand, five hundred fifty-seven".