6664351 has 2 divisors, whose sum is σ = 6664352. Its totient is φ = 6664350.

The previous prime is 6664321. The next prime is 6664381. The reversal of 6664351 is 1534666.

It is a balanced prime because it is at equal distance from previous prime (6664321) and next prime (6664381).

It is a cyclic number.

It is not a de Polignac number, because 6664351 - 2⁷ = 6664223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6664321) 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, 3332175 + 3332176.

It is an arithmetic number, because the mean of its divisors is an integer number (3332176).

Almost surely, 2^6664351 is an apocalyptic number.

6664351 is the 1155-th centered decagonal number.

6664351 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664351 is an equidigital number, since it uses as much as digits as its factorization.

6664351 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 31.

The square root of 6664351 is about 2581.5404316028. The cubic root of 6664351 is about 188.1854119950.

The spelling of 6664351 in words is "six million, six hundred sixty-four thousand, three hundred fifty-one".