6644712779 has 2 divisors, whose sum is σ = 6644712780. Its totient is φ = 6644712778.

The previous prime is 6644712743. The next prime is 6644712793. The reversal of 6644712779 is 9772174466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6644712779 - 2¹² = 6644708683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6644712779.

It is not a weakly prime, because it can be changed into another prime (6644712379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322356389 + 3322356390.

It is an arithmetic number, because the mean of its divisors is an integer number (3322356390).

Almost surely, 2^6644712779 is an apocalyptic number.

6644712779 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644712779 is an equidigital number, since it uses as much as digits as its factorization.

6644712779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3556224, while the sum is 53.

The square root of 6644712779 is about 81515.1076733632. The cubic root of 6644712779 is about 1880.0038459066.

The spelling of 6644712779 in words is "six billion, six hundred forty-four million, seven hundred twelve thousand, seven hundred seventy-nine".