6666447 has 8 divisors (see below), whose sum is σ = 8902656. Its totient is φ = 4437272.

The previous prime is 6666437. The next prime is 6666449. The reversal of 6666447 is 7446666.

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 6666447 - 2⁶ = 6666383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666449) 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, 1138 + ... + 3824.

It is an arithmetic number, because the mean of its divisors is an integer number (1112832).

Almost surely, 2^6666447 is an apocalyptic number.

6666447 is a deficient number, since it is larger than the sum of its proper divisors (2236209).

6666447 is a wasteful number, since it uses less digits than its factorization.

6666447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517.

The product of its digits is 145152, while the sum is 39.

The square root of 6666447 is about 2581.9463588541. The cubic root of 6666447 is about 188.2051386110.

The spelling of 6666447 in words is "six million, six hundred sixty-six thousand, four hundred forty-seven".