2166115161 has 32 divisors (see below), whose sum is σ = 3397236480. Its totient is φ = 1201741056.

The previous prime is 2166115139. The next prime is 2166115187. The reversal of 2166115161 is 1615116612.

It is not a de Polignac number, because 2166115161 - 2⁶ = 2166115097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2166115961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 392755 + ... + 398231.

It is an arithmetic number, because the mean of its divisors is an integer number (106163640).

Almost surely, 2^2166115161 is an apocalyptic number.

2166115161 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2166115161 is a deficient number, since it is larger than the sum of its proper divisors (1231121319).

2166115161 is a wasteful number, since it uses less digits than its factorization.

2166115161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6033.

The product of its digits is 2160, while the sum is 30.

The square root of 2166115161 is about 46541.5423143668. The cubic root of 2166115161 is about 1293.8795456454.

The spelling of 2166115161 in words is "two billion, one hundred sixty-six million, one hundred fifteen thousand, one hundred sixty-one".