6666740727 has 4 divisors (see below), whose sum is σ = 8888987640. Its totient is φ = 4444493816.

The previous prime is 6666740699. The next prime is 6666740749. The reversal of 6666740727 is 7270476666.

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 6666740727 - 2¹² = 6666736631 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6666740727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666740797) 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, 1111123452 + ... + 1111123457.

It is an arithmetic number, because the mean of its divisors is an integer number (2222246910).

Almost surely, 2^6666740727 is an apocalyptic number.

6666740727 is a deficient number, since it is larger than the sum of its proper divisors (2222246913).

6666740727 is a wasteful number, since it uses less digits than its factorization.

6666740727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222246912.

The product of its (nonzero) digits is 3556224, while the sum is 51.

The square root of 6666740727 is about 81650.1116165802. Note that the first 3 decimals coincide. The cubic root of 6666740727 is about 1882.0790270804.

The spelling of 6666740727 in words is "six billion, six hundred sixty-six million, seven hundred forty thousand, seven hundred twenty-seven".