6644763677 has 2 divisors, whose sum is σ = 6644763678. Its totient is φ = 6644763676.

The previous prime is 6644763673. The next prime is 6644763679. The reversal of 6644763677 is 7763674466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3545726116 + 3099037561 = 59546^2 + 55669^2 .

It is a cyclic number.

It is not a de Polignac number, because 6644763677 - 2² = 6644763673 is a prime.

Together with 6644763679, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6644763673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322381838 + 3322381839.

It is an arithmetic number, because the mean of its divisors is an integer number (3322381839).

Almost surely, 2^6644763677 is an apocalyptic number.

It is an amenable number.

6644763677 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644763677 is an equidigital number, since it uses as much as digits as its factorization.

6644763677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21337344, while the sum is 56.

The square root of 6644763677 is about 81515.4198725615. The cubic root of 6644763677 is about 1880.0086461237.

The spelling of 6644763677 in words is "six billion, six hundred forty-four million, seven hundred sixty-three thousand, six hundred seventy-seven".