6644636354 has 16 divisors (see below), whose sum is σ = 10556665848. Its totient is φ = 3125874432.

The previous prime is 6644636353. The next prime is 6644636363. The reversal of 6644636354 is 4536364466.

It can be written as a sum of positive squares in 4 ways, for example, as 6622216129 + 22420225 = 81377^2 + 4735^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6644636299 and 6644636308.

It is not an unprimeable number, because it can be changed into a prime (6644636353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80564 + ... + 140640.

Almost surely, 2^6644636354 is an apocalyptic number.

6644636354 is a deficient number, since it is larger than the sum of its proper divisors (3912029494).

6644636354 is a wasteful number, since it uses less digits than its factorization.

6644636354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63349.

The product of its digits is 3732480, while the sum is 47.

The square root of 6644636354 is about 81514.6388938821. The cubic root of 6644636354 is about 1879.9966381787.

The spelling of 6644636354 in words is "six billion, six hundred forty-four million, six hundred thirty-six thousand, three hundred fifty-four".