6643127 has 2 divisors, whose sum is σ = 6643128. Its totient is φ = 6643126.

The previous prime is 6643123. The next prime is 6643129. The reversal of 6643127 is 7213466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6643127 - 2² = 6643123 is a prime.

It is a super-2 number, since 2×6643127² = 88262272676258, which contains 22 as substring.

Together with 6643129, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₄₅₃₉₀₈ and since 6643127 and 453908 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6643127.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6643123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3321563 + 3321564.

It is an arithmetic number, because the mean of its divisors is an integer number (3321564).

Almost surely, 2^6643127 is an apocalyptic number.

6643127 is a deficient number, since it is larger than the sum of its proper divisors (1).

6643127 is an equidigital number, since it uses as much as digits as its factorization.

6643127 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 29.

The square root of 6643127 is about 2577.4264295999. The cubic root of 6643127 is about 187.9854277976.

The spelling of 6643127 in words is "six million, six hundred forty-three thousand, one hundred twenty-seven".