6566551 has 2 divisors, whose sum is σ = 6566552. Its totient is φ = 6566550.

The previous prime is 6566507. The next prime is 6566563. The reversal of 6566551 is 1556656.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6566551 - 2¹³ = 6558359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6566591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3283275 + 3283276.

It is an arithmetic number, because the mean of its divisors is an integer number (3283276).

Almost surely, 2^6566551 is an apocalyptic number.

6566551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6566551 is an equidigital number, since it uses as much as digits as its factorization.

6566551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 34.

The square root of 6566551 is about 2562.5282437468. The cubic root of 6566551 is about 187.2603254669.

It can be divided in two parts, 656655 and 1, that added together give a palindrome (656656).

The spelling of 6566551 in words is "six million, five hundred sixty-six thousand, five hundred fifty-one".