6644556673 has 2 divisors, whose sum is σ = 6644556674. Its totient is φ = 6644556672.

The previous prime is 6644556619. The next prime is 6644556683. The reversal of 6644556673 is 3766554466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6633613809 + 10942864 = 81447^2 + 3308^2 .

It is a cyclic number.

It is not a de Polignac number, because 6644556673 - 2⁹ = 6644556161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6644556673.

It is not a weakly prime, because it can be changed into another prime (6644556683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322278336 + 3322278337.

It is an arithmetic number, because the mean of its divisors is an integer number (3322278337).

Almost surely, 2^6644556673 is an apocalyptic number.

It is an amenable number.

6644556673 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644556673 is an equidigital number, since it uses as much as digits as its factorization.

6644556673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10886400, while the sum is 52.

The square root of 6644556673 is about 81514.1501397150. The cubic root of 6644556673 is about 1879.9891233149.

The spelling of 6644556673 in words is "six billion, six hundred forty-four million, five hundred fifty-six thousand, six hundred seventy-three".