6443716745 has 16 divisors (see below), whose sum is σ = 7781683728. Its totient is φ = 5122206720.

The previous prime is 6443716739. The next prime is 6443716787. The reversal of 6443716745 is 5476173446.

It can be written as a sum of positive squares in 8 ways, for example, as 1406550016 + 5037166729 = 37504^2 + 70973^2 .

It is not a de Polignac number, because 6443716745 - 2⁶ = 6443716681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6443716745.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1497437 + ... + 1501733.

It is an arithmetic number, because the mean of its divisors is an integer number (486355233).

Almost surely, 2^6443716745 is an apocalyptic number.

It is an amenable number.

6443716745 is a deficient number, since it is larger than the sum of its proper divisors (1337966983).

6443716745 is a wasteful number, since it uses less digits than its factorization.

6443716745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6140.

The product of its digits is 1693440, while the sum is 47.

The square root of 6443716745 is about 80272.7646527762. The cubic root of 6443716745 is about 1860.8533434549.

The spelling of 6443716745 in words is "six billion, four hundred forty-three million, seven hundred sixteen thousand, seven hundred forty-five".