2168395915 has 16 divisors (see below), whose sum is σ = 3054174912. Its totient is φ = 1446712704.

The previous prime is 2168395897. The next prime is 2168395921. The reversal of 2168395915 is 5195938612.

It is a 7-Lehmer number, since φ(2168395915) divides (2168395915-1)⁷.

It is a cyclic number.

It is not a de Polignac number, because 2168395915 - 2¹⁷ = 2168264843 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a nontrivial repunit in base 1294.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 835924 + ... + 838513.

It is an arithmetic number, because the mean of its divisors is an integer number (190885932).

Almost surely, 2^2168395915 is an apocalyptic number.

2168395915 is a deficient number, since it is larger than the sum of its proper divisors (885778997).

2168395915 is a wasteful number, since it uses less digits than its factorization.

2168395915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1674486.

The product of its digits is 583200, while the sum is 49.

The square root of 2168395915 is about 46566.0382145615. The cubic root of 2168395915 is about 1294.3335051693. Note that the first 3 decimals are identical.

The spelling of 2168395915 in words is "two billion, one hundred sixty-eight million, three hundred ninety-five thousand, nine hundred fifteen".