2166612166 has 4 divisors (see below), whose sum is σ = 3249918252. Its totient is φ = 1083306082.

The previous prime is 2166612143. The next prime is 2166612181. The reversal of 2166612166 is 6612166612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541653040 + ... + 541653043.

It is an arithmetic number, because the mean of its divisors is an integer number (812479563).

Almost surely, 2^2166612166 is an apocalyptic number.

2166612166 is a deficient number, since it is larger than the sum of its proper divisors (1083306086).

2166612166 is a wasteful number, since it uses less digits than its factorization.

2166612166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083306085.

The product of its digits is 31104, while the sum is 37.

The square root of 2166612166 is about 46546.8813778109. The cubic root of 2166612166 is about 1293.9784962827.

Adding to 2166612166 its reverse (6612166612), we get a palindrome (8778778778).

The spelling of 2166612166 in words is "two billion, one hundred sixty-six million, six hundred twelve thousand, one hundred sixty-six".