6664547 has 2 divisors, whose sum is σ = 6664548. Its totient is φ = 6664546.

The previous prime is 6664543. The next prime is 6664571. The reversal of 6664547 is 7454666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6664547 - 2² = 6664543 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 6664547.

It is not a weakly prime, because it can be changed into another prime (6664543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332273 + 3332274.

It is an arithmetic number, because the mean of its divisors is an integer number (3332274).

Almost surely, 2^6664547 is an apocalyptic number.

6664547 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664547 is an equidigital number, since it uses as much as digits as its factorization.

6664547 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 38.

The square root of 6664547 is about 2581.5783931541. The cubic root of 6664547 is about 188.1872568348.

The spelling of 6664547 in words is "six million, six hundred sixty-four thousand, five hundred forty-seven".