6636691 has 8 divisors (see below), whose sum is σ = 6746544. Its totient is φ = 6528000.

The previous prime is 6636689. The next prime is 6636701. The reversal of 6636691 is 1966366.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6636691 - 2¹ = 6636689 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6636691.

It is not an unprimeable number, because it can be changed into a prime (6636611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26316 + ... + 26566.

It is an arithmetic number, because the mean of its divisors is an integer number (843318).

Almost surely, 2^6636691 is an apocalyptic number.

6636691 is a deficient number, since it is larger than the sum of its proper divisors (109853).

6636691 is a wasteful number, since it uses less digits than its factorization.

6636691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581.

The product of its digits is 34992, while the sum is 37.

The square root of 6636691 is about 2576.1775948098. The cubic root of 6636691 is about 187.9247001142.

It can be divided in two parts, 66366 and 91, that multiplied together give a palindrome (6039306).

The spelling of 6636691 in words is "six million, six hundred thirty-six thousand, six hundred ninety-one".