6665191 has 6 divisors (see below), whose sum is σ = 7217520. Its totient is φ = 6152328.

The previous prime is 6665179. The next prime is 6665201. The reversal of 6665191 is 1915666.

It is not a de Polignac number, because 6665191 - 2⁵ = 6665159 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19551 + ... + 19888.

It is an arithmetic number, because the mean of its divisors is an integer number (1202920).

Almost surely, 2^6665191 is an apocalyptic number.

6665191 is a deficient number, since it is larger than the sum of its proper divisors (552329).

6665191 is a wasteful number, since it uses less digits than its factorization.

6665191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39465 (or 39452 counting only the distinct ones).

The product of its digits is 9720, while the sum is 34.

The square root of 6665191 is about 2581.7031200353. The cubic root of 6665191 is about 188.1933181965.

The spelling of 6665191 in words is "six million, six hundred sixty-five thousand, one hundred ninety-one".