6661211 has 2 divisors, whose sum is σ = 6661212. Its totient is φ = 6661210.

The previous prime is 6661189. The next prime is 6661217. The reversal of 6661211 is 1121666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6661211 - 2²² = 2466907 is a prime.

It is not a weakly prime, because it can be changed into another prime (6661217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330605 + 3330606.

It is an arithmetic number, because the mean of its divisors is an integer number (3330606).

Almost surely, 2^6661211 is an apocalyptic number.

6661211 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661211 is an equidigital number, since it uses as much as digits as its factorization.

6661211 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 23.

The square root of 6661211 is about 2580.9321959323. The cubic root of 6661211 is about 188.1558519762.

Adding to 6661211 its reverse (1121666), we get a palindrome (7782877).

The spelling of 6661211 in words is "six million, six hundred sixty-one thousand, two hundred eleven".