6661189 has 2 divisors, whose sum is σ = 6661190. Its totient is φ = 6661188.

The previous prime is 6661157. The next prime is 6661211. The reversal of 6661189 is 9811666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4133089 + 2528100 = 2033^2 + 1590^2 .

It is a cyclic number.

It is not a de Polignac number, because 6661189 - 2⁵ = 6661157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6631189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330594 + 3330595.

It is an arithmetic number, because the mean of its divisors is an integer number (3330595).

Almost surely, 2^6661189 is an apocalyptic number.

It is an amenable number.

6661189 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661189 is an equidigital number, since it uses as much as digits as its factorization.

6661189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 37.

The square root of 6661189 is about 2580.9279339028. The cubic root of 6661189 is about 188.1556448351.

The spelling of 6661189 in words is "six million, six hundred sixty-one thousand, one hundred eighty-nine".