6647761 has 2 divisors, whose sum is σ = 6647762. Its totient is φ = 6647760.

The previous prime is 6647747. The next prime is 6647779. The reversal of 6647761 is 1677466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6076225 + 571536 = 2465^2 + 756^2 .

It is a cyclic number.

It is not a de Polignac number, because 6647761 - 2¹¹ = 6645713 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6647761.

It is not a weakly prime, because it can be changed into another prime (6647741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3323880 + 3323881.

It is an arithmetic number, because the mean of its divisors is an integer number (3323881).

Almost surely, 2^6647761 is an apocalyptic number.

It is an amenable number.

6647761 is a deficient number, since it is larger than the sum of its proper divisors (1).

6647761 is an equidigital number, since it uses as much as digits as its factorization.

6647761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336, while the sum is 37.

The square root of 6647761 is about 2578.3252316184. The cubic root of 6647761 is about 188.0291282014.

The spelling of 6647761 in words is "six million, six hundred forty-seven thousand, seven hundred sixty-one".