6660109 has 2 divisors, whose sum is σ = 6660110. Its totient is φ = 6660108.

The previous prime is 6660103. The next prime is 6660113. The reversal of 6660109 is 9010666.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6502500 + 157609 = 2550^2 + 397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6660109 is a prime.

It is a nialpdrome in base 14.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6660103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330054 + 3330055.

It is an arithmetic number, because the mean of its divisors is an integer number (3330055).

Almost surely, 2^6660109 is an apocalyptic number.

It is an amenable number.

6660109 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660109 is an equidigital number, since it uses as much as digits as its factorization.

6660109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 6660109 is about 2580.7186983474. The cubic root of 6660109 is about 188.1454755255.

The spelling of 6660109 in words is "six million, six hundred sixty thousand, one hundred nine".