6663869 has 2 divisors, whose sum is σ = 6663870. Its totient is φ = 6663868.

The previous prime is 6663863. The next prime is 6663893. The reversal of 6663869 is 9683666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5784025 + 879844 = 2405^2 + 938^2 .

It is a cyclic number.

It is not a de Polignac number, because 6663869 - 2¹² = 6659773 is a prime.

It is a super-2 number, since 2×6663869² = 88814300098322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6663863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3331934 + 3331935.

It is an arithmetic number, because the mean of its divisors is an integer number (3331935).

Almost surely, 2^6663869 is an apocalyptic number.

It is an amenable number.

6663869 is a deficient number, since it is larger than the sum of its proper divisors (1).

6663869 is an equidigital number, since it uses as much as digits as its factorization.

6663869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 279936, while the sum is 44.

The square root of 6663869 is about 2581.4470748013. The cubic root of 6663869 is about 188.1808750413.

The spelling of 6663869 in words is "six million, six hundred sixty-three thousand, eight hundred sixty-nine".