2811981166 has 8 divisors (see below), whose sum is σ = 4265364960. Its totient is φ = 1390192848.

The previous prime is 2811981149. The next prime is 2811981181. The reversal of 2811981166 is 6611891182.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7898646 + ... + 7899001.

It is an arithmetic number, because the mean of its divisors is an integer number (533170620).

Almost surely, 2^2811981166 is an apocalyptic number.

2811981166 is a deficient number, since it is larger than the sum of its proper divisors (1453383794).

2811981166 is a wasteful number, since it uses less digits than its factorization.

2811981166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15797738.

The product of its digits is 41472, while the sum is 43.

The square root of 2811981166 is about 53028.1167495132. The cubic root of 2811981166 is about 1411.4672394971.

The spelling of 2811981166 in words is "two billion, eight hundred eleven million, nine hundred eighty-one thousand, one hundred sixty-six".