6661747 has 2 divisors, whose sum is σ = 6661748. Its totient is φ = 6661746.

The previous prime is 6661741. The next prime is 6661751. The reversal of 6661747 is 7471666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6661747 is a prime.

It is not a weakly prime, because it can be changed into another prime (6661741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330873 + 3330874.

It is an arithmetic number, because the mean of its divisors is an integer number (3330874).

Almost surely, 2^6661747 is an apocalyptic number.

6661747 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661747 is an equidigital number, since it uses as much as digits as its factorization.

6661747 is an odious number, because the sum of its binary digits is odd.

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

The square root of 6661747 is about 2581.0360322940. The cubic root of 6661747 is about 188.1608985477.

The spelling of 6661747 in words is "six million, six hundred sixty-one thousand, seven hundred forty-seven".