6664997 has 2 divisors, whose sum is σ = 6664998. Its totient is φ = 6664996.

The previous prime is 6664979. The next prime is 6665011. The reversal of 6664997 is 7994666.

Together with previous prime (6664979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6558721 + 106276 = 2561^2 + 326^2 .

It is a cyclic number.

It is not a de Polignac number, because 6664997 - 2²² = 2470693 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6664937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332498 + 3332499.

It is an arithmetic number, because the mean of its divisors is an integer number (3332499).

Almost surely, 2^6664997 is an apocalyptic number.

It is an amenable number.

6664997 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664997 is an equidigital number, since it uses as much as digits as its factorization.

6664997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 47.

The square root of 6664997 is about 2581.6655476649. The cubic root of 6664997 is about 188.1914922994.

The spelling of 6664997 in words is "six million, six hundred sixty-four thousand, nine hundred ninety-seven".