2165911845 has 8 divisors (see below), whose sum is σ = 3465458976. Its totient is φ = 1155152976.

The previous prime is 2165911831. The next prime is 2165911861. The reversal of 2165911845 is 5481195612.

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

It is not a de Polignac number, because 2165911845 - 2⁷ = 2165911717 is a prime.

It is a super-2 number, since 2×2165911845² = 9382348240622608050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2165911797 and 2165911806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72197047 + ... + 72197076.

It is an arithmetic number, because the mean of its divisors is an integer number (433182372).

Almost surely, 2^2165911845 is an apocalyptic number.

It is an amenable number.

2165911845 is a deficient number, since it is larger than the sum of its proper divisors (1299547131).

2165911845 is a wasteful number, since it uses less digits than its factorization.

2165911845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144394131.

The product of its digits is 86400, while the sum is 42.

The square root of 2165911845 is about 46539.3580209268. The cubic root of 2165911845 is about 1293.8390623184.

The spelling of 2165911845 in words is "two billion, one hundred sixty-five million, nine hundred eleven thousand, eight hundred forty-five".