6544663 has 2 divisors, whose sum is σ = 6544664. Its totient is φ = 6544662.

The previous prime is 6544651. The next prime is 6544667. The reversal of 6544663 is 3664456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6544663 - 2⁵ = 6544631 is a prime.

It is a super-2 number, since 2×6544663² = 85665227567138, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6544667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272331 + 3272332.

It is an arithmetic number, because the mean of its divisors is an integer number (3272332).

Almost surely, 2^6544663 is an apocalyptic number.

6544663 is a deficient number, since it is larger than the sum of its proper divisors (1).

6544663 is an equidigital number, since it uses as much as digits as its factorization.

6544663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 51840, while the sum is 34.

The square root of 6544663 is about 2558.2538967038. The cubic root of 6544663 is about 187.0520316191.

The spelling of 6544663 in words is "six million, five hundred forty-four thousand, six hundred sixty-three".