6605691 has 4 divisors (see below), whose sum is σ = 8807592. Its totient is φ = 4403792.

The previous prime is 6605663. The next prime is 6605693. The reversal of 6605691 is 1965066.

6605691 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6605691 - 2⁷ = 6605563 is a prime.

It is a D-number.

6605691 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6605693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1100946 + ... + 1100951.

It is an arithmetic number, because the mean of its divisors is an integer number (2201898).

Almost surely, 2^6605691 is an apocalyptic number.

6605691 is a deficient number, since it is larger than the sum of its proper divisors (2201901).

6605691 is a wasteful number, since it uses less digits than its factorization.

6605691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201900.

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 6605691 is about 2570.1538864434. The cubic root of 6605691 is about 187.6316444392.

The spelling of 6605691 in words is "six million, six hundred five thousand, six hundred ninety-one".