2165041166 has 4 divisors (see below), whose sum is σ = 3247561752. Its totient is φ = 1082520582.

The previous prime is 2165041157. The next prime is 2165041169. The reversal of 2165041166 is 6611405612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165041169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541260290 + ... + 541260293.

It is an arithmetic number, because the mean of its divisors is an integer number (811890438).

Almost surely, 2^2165041166 is an apocalyptic number.

2165041166 is a deficient number, since it is larger than the sum of its proper divisors (1082520586).

2165041166 is a wasteful number, since it uses less digits than its factorization.

2165041166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1082520585.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 2165041166 is about 46530.0028583709. The cubic root of 2165041166 is about 1293.6656681446.

Adding to 2165041166 its reverse (6611405612), we get a palindrome (8776446778).

The spelling of 2165041166 in words is "two billion, one hundred sixty-five million, forty-one thousand, one hundred sixty-six".