5666691 has 4 divisors (see below), whose sum is σ = 7555592. Its totient is φ = 3777792.

The previous prime is 5666681. The next prime is 5666701. The reversal of 5666691 is 1966665.

5666691 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 an interprime number because it is at equal distance from previous prime (5666681) and next prime (5666701).

It is not a de Polignac number, because 5666691 - 2¹⁵ = 5633923 is a prime.

It is a super-2 number, since 2×5666691² = 64222773778962, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5666621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 944446 + ... + 944451.

It is an arithmetic number, because the mean of its divisors is an integer number (1888898).

Almost surely, 2^5666691 is an apocalyptic number.

5666691 is a deficient number, since it is larger than the sum of its proper divisors (1888901).

5666691 is a wasteful number, since it uses less digits than its factorization.

5666691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888900.

The product of its digits is 58320, while the sum is 39.

The square root of 5666691 is about 2380.4812538644. The cubic root of 5666691 is about 178.2829632299.

The spelling of 5666691 in words is "five million, six hundred sixty-six thousand, six hundred ninety-one".