6666253447 has 8 divisors (see below), whose sum is σ = 7621834752. Its totient is φ = 5711487000.

The previous prime is 6666253411. The next prime is 6666253457. The reversal of 6666253447 is 7443526666.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6666253447 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6666253447.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666253457) 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, 186079 + ... + 218992.

It is an arithmetic number, because the mean of its divisors is an integer number (952729344).

Almost surely, 2^6666253447 is an apocalyptic number.

6666253447 is a deficient number, since it is larger than the sum of its proper divisors (955581305).

6666253447 is a wasteful number, since it uses less digits than its factorization.

6666253447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407429.

The product of its digits is 4354560, while the sum is 49.

The square root of 6666253447 is about 81647.1276102228. The cubic root of 6666253447 is about 1882.0331714992.

The spelling of 6666253447 in words is "six billion, six hundred sixty-six million, two hundred fifty-three thousand, four hundred forty-seven".