8621166891 has 4 divisors (see below), whose sum is σ = 11494889192. Its totient is φ = 5747444592.

The previous prime is 8621166877. The next prime is 8621166937. The reversal of 8621166891 is 1986611268.

8621166891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 8621166891 - 2⁵ = 8621166859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8621166891.

It is not an unprimeable number, because it can be changed into a prime (8621166811) 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, 1436861146 + ... + 1436861151.

It is an arithmetic number, because the mean of its divisors is an integer number (2873722298).

Almost surely, 2^8621166891 is an apocalyptic number.

8621166891 is a deficient number, since it is larger than the sum of its proper divisors (2873722301).

8621166891 is a wasteful number, since it uses less digits than its factorization.

8621166891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2873722300.

The product of its digits is 248832, while the sum is 48.

The square root of 8621166891 is about 92850.2390465420. The cubic root of 8621166891 is about 2050.4791179166.

The spelling of 8621166891 in words is "eight billion, six hundred twenty-one million, one hundred sixty-six thousand, eight hundred ninety-one".