6644636345 has 16 divisors (see below), whose sum is σ = 8112251520. Its totient is φ = 5223329664.

The previous prime is 6644636333. The next prime is 6644636353. The reversal of 6644636345 is 5436364466.

It is a cyclic number.

It is not a de Polignac number, because 6644636345 - 2⁴ = 6644636329 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6644636345.

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, 1065677 + ... + 1071893.

It is an arithmetic number, because the mean of its divisors is an integer number (507015720).

Almost surely, 2^6644636345 is an apocalyptic number.

It is an amenable number.

6644636345 is a deficient number, since it is larger than the sum of its proper divisors (1467615175).

6644636345 is a wasteful number, since it uses less digits than its factorization.

6644636345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9904.

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

The square root of 6644636345 is about 81514.6388386773. The cubic root of 6644636345 is about 1879.9966373299.

The spelling of 6644636345 in words is "six billion, six hundred forty-four million, six hundred thirty-six thousand, three hundred forty-five".