6671663 has 2 divisors, whose sum is σ = 6671664. Its totient is φ = 6671662.

The previous prime is 6671647. The next prime is 6671669. The reversal of 6671663 is 3661766.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6671663 - 2⁴ = 6671647 is a prime.

It is a super-2 number, since 2×6671663² = 89022174371138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6671669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3335831 + 3335832.

It is an arithmetic number, because the mean of its divisors is an integer number (3335832).

Almost surely, 2^6671663 is an apocalyptic number.

6671663 is a deficient number, since it is larger than the sum of its proper divisors (1).

6671663 is an equidigital number, since it uses as much as digits as its factorization.

6671663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 6671663 is about 2582.9562520492. The cubic root of 6671663 is about 188.2542113322.

The spelling of 6671663 in words is "six million, six hundred seventy-one thousand, six hundred sixty-three".