6660791 has 2 divisors, whose sum is σ = 6660792. Its totient is φ = 6660790.

The previous prime is 6660781. The next prime is 6660799. The reversal of 6660791 is 1970666.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6660791 is a prime.

It is a super-2 number, since 2×6660791² = 88732273491362, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6660799) 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, 3330395 + 3330396.

It is an arithmetic number, because the mean of its divisors is an integer number (3330396).

Almost surely, 2^6660791 is an apocalyptic number.

6660791 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660791 is an equidigital number, since it uses as much as digits as its factorization.

6660791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 6660791 is about 2580.8508286997. The cubic root of 6660791 is about 188.1518973841.

The spelling of 6660791 in words is "six million, six hundred sixty thousand, seven hundred ninety-one".