6661109 has 12 divisors (see below), whose sum is σ = 8345484. Its totient is φ = 5269824.

The previous prime is 6661103. The next prime is 6661111. The reversal of 6661109 is 9011666.

It can be written as a sum of positive squares in 2 ways, for example, as 3598609 + 3062500 = 1897^2 + 1750^2 .

It is not a de Polignac number, because 6661109 - 2¹⁶ = 6595573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4592 + ... + 5865.

It is an arithmetic number, because the mean of its divisors is an integer number (695457).

Almost surely, 2^6661109 is an apocalyptic number.

It is an amenable number.

6661109 is a deficient number, since it is larger than the sum of its proper divisors (1684375).

6661109 is a wasteful number, since it uses less digits than its factorization.

6661109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10484 (or 10477 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 29.

The square root of 6661109 is about 2580.9124355545. The cubic root of 6661109 is about 188.1548915906.

The spelling of 6661109 in words is "six million, six hundred sixty-one thousand, one hundred nine".