6805191666 has 64 divisors (see below), whose sum is σ = 16914014208. Its totient is φ = 1777336128.

The previous prime is 6805191593. The next prime is 6805191667. The reversal of 6805191666 is 6661915086.

It is a super-2 number, since 2×6805191666² = 92621267221991711112, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6805191667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4266 + ... + 116741.

It is an arithmetic number, because the mean of its divisors is an integer number (264281472).

Almost surely, 2^6805191666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6805191666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8457007104).

6805191666 is an abundant number, since it is smaller than the sum of its proper divisors (10108822542).

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

6805191666 is a wasteful number, since it uses less digits than its factorization.

6805191666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121135.

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 6805191666 is about 82493.5856051851. The cubic root of 6805191666 is about 1895.0184988088.

The spelling of 6805191666 in words is "six billion, eight hundred five million, one hundred ninety-one thousand, six hundred sixty-six".