6666276247 has 4 divisors (see below), whose sum is σ = 6779264040. Its totient is φ = 6553288456.

The previous prime is 6666276151. The next prime is 6666276263. The reversal of 6666276247 is 7426726666.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7426726666 = 2 ⋅3713363333.

It is a cyclic number.

It is not a de Polignac number, because 6666276247 - 2³¹ = 4518792599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6666276194 and 6666276203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666274247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56493808 + ... + 56493925.

It is an arithmetic number, because the mean of its divisors is an integer number (1694816010).

Almost surely, 2^6666276247 is an apocalyptic number.

6666276247 is a deficient number, since it is larger than the sum of its proper divisors (112987793).

6666276247 is a wasteful number, since it uses less digits than its factorization.

6666276247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112987792.

The product of its digits is 6096384, while the sum is 52.

The square root of 6666276247 is about 81647.2672353460. The cubic root of 6666276247 is about 1882.0353171476.

The spelling of 6666276247 in words is "six billion, six hundred sixty-six million, two hundred seventy-six thousand, two hundred forty-seven".