6661823 has 4 divisors (see below), whose sum is σ = 7613520. Its totient is φ = 5710128.

The previous prime is 6661783. The next prime is 6661849. The reversal of 6661823 is 3281666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3281666 = 2 ⋅1640833.

It is a cyclic number.

It is not a de Polignac number, because 6661823 - 2¹⁰ = 6660799 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 6661823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661873) 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, 475838 + ... + 475851.

It is an arithmetic number, because the mean of its divisors is an integer number (1903380).

Almost surely, 2^6661823 is an apocalyptic number.

6661823 is a deficient number, since it is larger than the sum of its proper divisors (951697).

6661823 is an equidigital number, since it uses as much as digits as its factorization.

6661823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951696.

The product of its digits is 10368, while the sum is 32.

The square root of 6661823 is about 2581.0507550221. The cubic root of 6661823 is about 188.1616140844.

The spelling of 6661823 in words is "six million, six hundred sixty-one thousand, eight hundred twenty-three".