6666722339 has 4 divisors (see below), whose sum is σ = 6956579856. Its totient is φ = 6376864824.

The previous prime is 6666722323. The next prime is 6666722341. The reversal of 6666722339 is 9332276666.

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 6666722339 - 2⁴ = 6666722323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666722399) 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, 144928724 + ... + 144928769.

It is an arithmetic number, because the mean of its divisors is an integer number (1739144964).

Almost surely, 2^6666722339 is an apocalyptic number.

6666722339 is a deficient number, since it is larger than the sum of its proper divisors (289857517).

6666722339 is a wasteful number, since it uses less digits than its factorization.

6666722339 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289857516.

The product of its digits is 2939328, while the sum is 50.

The square root of 6666722339 is about 81649.9990140845. Note that the first 3 decimals coincide. The cubic root of 6666722339 is about 1882.0772967146.

The spelling of 6666722339 in words is "six billion, six hundred sixty-six million, seven hundred twenty-two thousand, three hundred thirty-nine".