6661771666 has 8 divisors (see below), whose sum is σ = 10901080944. Its totient is φ = 3028078020.

The previous prime is 6661771661. The next prime is 6661771667.

6661771666 is nontrivially palindromic in base 10.

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

It is not an unprimeable number, because it can be changed into a prime (6661771661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151403880 + ... + 151403923.

It is an arithmetic number, because the mean of its divisors is an integer number (1362635118).

Almost surely, 2^6661771666 is an apocalyptic number.

6661771666 is a deficient number, since it is larger than the sum of its proper divisors (4239309278).

6661771666 is a wasteful number, since it uses less digits than its factorization.

6661771666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302807816.

The product of its digits is 2286144, while the sum is 52.

The square root of 6661771666 is about 81619.6769535386. The cubic root of 6661771666 is about 1881.6113077762.

The spelling of 6661771666 in words is "six billion, six hundred sixty-one million, seven hundred seventy-one thousand, six hundred sixty-six".