6541663 has 2 divisors, whose sum is σ = 6541664. Its totient is φ = 6541662.

The previous prime is 6541621. The next prime is 6541687. The reversal of 6541663 is 3661456.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6541663 - 2⁹ = 6541151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6541693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270831 + 3270832.

It is an arithmetic number, because the mean of its divisors is an integer number (3270832).

Almost surely, 2^6541663 is an apocalyptic number.

6541663 is a deficient number, since it is larger than the sum of its proper divisors (1).

6541663 is an equidigital number, since it uses as much as digits as its factorization.

6541663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 31.

The square root of 6541663 is about 2557.6674920716. The cubic root of 6541663 is about 187.0234464010.

The spelling of 6541663 in words is "six million, five hundred forty-one thousand, six hundred sixty-three".