6667557666 has 32 divisors (see below), whose sum is σ = 16625599488. Its totient is φ = 1731833040.

The previous prime is 6667557601. The next prime is 6667557667.

6667557666 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (6667557667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7215510 + ... + 7216433.

It is an arithmetic number, because the mean of its divisors is an integer number (519549984).

Almost surely, 2^6667557666 is an apocalyptic number.

6667557666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6667557666 is an abundant number, since it is smaller than the sum of its proper divisors (9958041822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6667557666 is a wasteful number, since it uses less digits than its factorization.

6667557666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14431966.

The product of its digits is 57153600, while the sum is 60.

The square root of 6667557666 is about 81655.1141447981. The cubic root of 6667557666 is about 1882.1559002744.

The spelling of 6667557666 in words is "six billion, six hundred sixty-seven million, five hundred fifty-seven thousand, six hundred sixty-six".