6656447 has 4 divisors (see below), whose sum is σ = 7607376. Its totient is φ = 5705520.

The previous prime is 6656437. The next prime is 6656449. The reversal of 6656447 is 7446566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7446566 = 2 ⋅3723283.

It is a cyclic number.

It is not a de Polignac number, because 6656447 - 2¹⁰ = 6655423 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6656447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656449) 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, 475454 + ... + 475467.

It is an arithmetic number, because the mean of its divisors is an integer number (1901844).

Almost surely, 2^6656447 is an apocalyptic number.

6656447 is a deficient number, since it is larger than the sum of its proper divisors (950929).

6656447 is an equidigital number, since it uses as much as digits as its factorization.

6656447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 950928.

The product of its digits is 120960, while the sum is 38.

The square root of 6656447 is about 2580.0091085111. The cubic root of 6656447 is about 188.1109858473.

The spelling of 6656447 in words is "six million, six hundred fifty-six thousand, four hundred forty-seven".