6664873 has 2 divisors, whose sum is σ = 6664874. Its totient is φ = 6664872.

The previous prime is 6664859. The next prime is 6664891. The reversal of 6664873 is 3784666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5938969 + 725904 = 2437^2 + 852^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6664873 is a prime.

It is a super-2 number, since 2×6664873² = 88841064212258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6664843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332436 + 3332437.

It is an arithmetic number, because the mean of its divisors is an integer number (3332437).

Almost surely, 2^6664873 is an apocalyptic number.

It is an amenable number.

6664873 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664873 is an equidigital number, since it uses as much as digits as its factorization.

6664873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 40.

The square root of 6664873 is about 2581.6415320489. The cubic root of 6664873 is about 188.1903252126.

The spelling of 6664873 in words is "six million, six hundred sixty-four thousand, eight hundred seventy-three".