2166261115 has 8 divisors (see below), whose sum is σ = 2605305600. Its totient is φ = 1729147392.

The previous prime is 2166261113. The next prime is 2166261127. The reversal of 2166261115 is 5111626612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166261115 - 2¹ = 2166261113 is a prime.

It is a super-2 number, since 2×2166261115² = 9385374436722086450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2166261113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480219 + ... + 484708.

It is an arithmetic number, because the mean of its divisors is an integer number (325663200).

Almost surely, 2^2166261115 is an apocalyptic number.

2166261115 is a deficient number, since it is larger than the sum of its proper divisors (439044485).

2166261115 is an equidigital number, since it uses as much as digits as its factorization.

2166261115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965381.

The product of its digits is 4320, while the sum is 31.

The square root of 2166261115 is about 46543.1102849820. The cubic root of 2166261115 is about 1293.9086057584.

Adding to 2166261115 its reverse (5111626612), we get a palindrome (7277887727).

The spelling of 2166261115 in words is "two billion, one hundred sixty-six million, two hundred sixty-one thousand, one hundred fifteen".