6661847 has 4 divisors (see below), whose sum is σ = 6671280. Its totient is φ = 6652416.

The previous prime is 6661783. The next prime is 6661849. The reversal of 6661847 is 7481666.

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 6661847 - 2⁶ = 6661783 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 6661847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661849) 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, 3563 + ... + 5100.

It is an arithmetic number, because the mean of its divisors is an integer number (1667820).

Almost surely, 2^6661847 is an apocalyptic number.

6661847 is a deficient number, since it is larger than the sum of its proper divisors (9433).

6661847 is an equidigital number, since it uses as much as digits as its factorization.

6661847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9432.

The product of its digits is 48384, while the sum is 38.

The square root of 6661847 is about 2581.0554042872. The cubic root of 6661847 is about 188.1618400423.

The spelling of 6661847 in words is "six million, six hundred sixty-one thousand, eight hundred forty-seven".