6666775811 has 4 divisors (see below), whose sum is σ = 7058939112. Its totient is φ = 6274612512.

The previous prime is 6666775799. The next prime is 6666775813. The reversal of 6666775811 is 1185776666.

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 6666775811 - 2¹⁰ = 6666774787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6666775813) 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, 196081625 + ... + 196081658.

It is an arithmetic number, because the mean of its divisors is an integer number (1764734778).

Almost surely, 2^6666775811 is an apocalyptic number.

6666775811 is a deficient number, since it is larger than the sum of its proper divisors (392163301).

6666775811 is a wasteful number, since it uses less digits than its factorization.

6666775811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 392163300.

The product of its digits is 2540160, while the sum is 53.

The square root of 6666775811 is about 81650.3264598495. The cubic root of 6666775811 is about 1882.0823285810.

The spelling of 6666775811 in words is "six billion, six hundred sixty-six million, seven hundred seventy-five thousand, eight hundred eleven".