2166996611 has 16 divisors (see below), whose sum is σ = 2371987968. Its totient is φ = 1967565600.

The previous prime is 2166996583. The next prime is 2166996661. The reversal of 2166996611 is 1166996612.

It is a happy number.

It is not a de Polignac number, because 2166996611 - 2⁶ = 2166996547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166996661) 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, 792116 + ... + 794846.

It is an arithmetic number, because the mean of its divisors is an integer number (148249248).

Almost surely, 2^2166996611 is an apocalyptic number.

2166996611 is a deficient number, since it is larger than the sum of its proper divisors (204991357).

2166996611 is a wasteful number, since it uses less digits than its factorization.

2166996611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3722.

The product of its digits is 209952, while the sum is 47.

The square root of 2166996611 is about 46551.0108483156. The cubic root of 2166996611 is about 1294.0550265374.

Subtracting from 2166996611 its reverse (1166996612), we obtain a palindrome (999999999).

The spelling of 2166996611 in words is "two billion, one hundred sixty-six million, nine hundred ninety-six thousand, six hundred eleven".