2161166111 has 16 divisors (see below), whose sum is σ = 2406147744. Its totient is φ = 1928392704.

The previous prime is 2161166093. The next prime is 2161166131. The reversal of 2161166111 is 1116611612.

It is a cyclic number.

It is not a de Polignac number, because 2161166111 - 2¹⁸ = 2160903967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161166131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34295 + ... + 74151.

It is an arithmetic number, because the mean of its divisors is an integer number (150384234).

Almost surely, 2^2161166111 is an apocalyptic number.

2161166111 is a deficient number, since it is larger than the sum of its proper divisors (244981633).

2161166111 is a wasteful number, since it uses less digits than its factorization.

2161166111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40010.

The product of its digits is 432, while the sum is 26.

The square root of 2161166111 is about 46488.3438186391. The cubic root of 2161166111 is about 1292.8933934657.

Adding to 2161166111 its reverse (1116611612), we get a palindrome (3277777723).

The spelling of 2161166111 in words is "two billion, one hundred sixty-one million, one hundred sixty-six thousand, one hundred eleven".