6667887666 has 16 divisors (see below), whose sum is σ = 14548118688. Its totient is φ = 2020572000.

The previous prime is 6667887659. The next prime is 6667887689.

6667887666 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66), and also a Moran number because the ratio is a prime number: 101028601 = 6667887666 / (6 + 6 + 6 + 7 + 8 + 8 + 7 + 6 + 6 + 6).

It is a junction number, because it is equal to n+sod(n) for n = 6667887597 and 6667887606.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50514235 + ... + 50514366.

It is an arithmetic number, because the mean of its divisors is an integer number (909257418).

Almost surely, 2^6667887666 is an apocalyptic number.

6667887666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6667887666 is an abundant number, since it is smaller than the sum of its proper divisors (7880231022).

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

6667887666 is a wasteful number, since it uses less digits than its factorization.

6667887666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101028617.

The product of its digits is 146313216, while the sum is 66.

The square root of 6667887666 is about 81657.1348138055. The cubic root of 6667887666 is about 1882.1869511845.

The spelling of 6667887666 in words is "six billion, six hundred sixty-seven million, eight hundred eighty-seven thousand, six hundred sixty-six".