6443952489 has 28 divisors (see below), whose sum is σ = 10404717316. Its totient is φ = 3965503392.

The previous prime is 6443952479. The next prime is 6443952491. The reversal of 6443952489 is 9842593446.

6443952489 is a `hidden beast` number, since 6 + 4 + 4 + 39 + 524 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1420686864 + 5023265625 = 37692^2 + 70875^2 .

It is not a de Polignac number, because 6443952489 - 2⁸ = 6443952233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6443952419) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 330502 + ... + 349455.

It is an arithmetic number, because the mean of its divisors is an integer number (371597047).

Almost surely, 2^6443952489 is an apocalyptic number.

It is an amenable number.

6443952489 is a deficient number, since it is larger than the sum of its proper divisors (3960764827).

6443952489 is an equidigital number, since it uses as much as digits as its factorization.

6443952489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679988 (or 679973 counting only the distinct ones).

The product of its digits is 7464960, while the sum is 54.

The square root of 6443952489 is about 80274.2330327733. The cubic root of 6443952489 is about 1860.8760363447.

The spelling of 6443952489 in words is "six billion, four hundred forty-three million, nine hundred fifty-two thousand, four hundred eighty-nine".