6445335397 has 2 divisors, whose sum is σ = 6445335398. Its totient is φ = 6445335396.

The previous prime is 6445335389. The next prime is 6445335419. The reversal of 6445335397 is 7935335446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5491699236 + 953636161 = 74106^2 + 30881^2 .

It is a cyclic number.

It is not a de Polignac number, because 6445335397 - 2³ = 6445335389 is a prime.

It is a super-2 number, since 2×6445335397² = 83084696759642295218, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6445335397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6445333397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3222667698 + 3222667699.

It is an arithmetic number, because the mean of its divisors is an integer number (3222667699).

Almost surely, 2^6445335397 is an apocalyptic number.

It is an amenable number.

6445335397 is a deficient number, since it is larger than the sum of its proper divisors (1).

6445335397 is an equidigital number, since it uses as much as digits as its factorization.

6445335397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4082400, while the sum is 49.

The square root of 6445335397 is about 80282.8462188530. The cubic root of 6445335397 is about 1861.0091449347.

Adding to 6445335397 its sum of digits (49), we get a palindrome (6445335446).

The spelling of 6445335397 in words is "six billion, four hundred forty-five million, three hundred thirty-five thousand, three hundred ninety-seven".