6444635345 has 16 divisors (see below), whose sum is σ = 8040882960. Its totient is φ = 4952634624.

The previous prime is 6444635333. The next prime is 6444635357. The reversal of 6444635345 is 5435364446.

It is an interprime number because it is at equal distance from previous prime (6444635333) and next prime (6444635357).

It can be written as a sum of positive squares in 8 ways, for example, as 56310016 + 6388325329 = 7504^2 + 79927^2 .

It is a cyclic number.

It is not a de Polignac number, because 6444635345 - 2²⁰ = 6443586769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6444635296 and 6444635305.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 84242 + ... + 141371.

It is an arithmetic number, because the mean of its divisors is an integer number (502555185).

Almost surely, 2^6444635345 is an apocalyptic number.

It is an amenable number.

6444635345 is a deficient number, since it is larger than the sum of its proper divisors (1596247615).

6444635345 is a wasteful number, since it uses less digits than its factorization.

6444635345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225844.

The product of its digits is 2073600, while the sum is 44.

The square root of 6444635345 is about 80278.4861902615. The cubic root of 6444635345 is about 1860.9417654391.

The spelling of 6444635345 in words is "six billion, four hundred forty-four million, six hundred thirty-five thousand, three hundred forty-five".