2017120665 has 128 divisors (see below), whose sum is σ = 3971358720. Its totient is φ = 854784000.

The previous prime is 2017120657. The next prime is 2017120691. The reversal of 2017120665 is 5660217102.

It is not a de Polignac number, because 2017120665 - 2³ = 2017120657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 13358340 + ... + 13358490.

It is an arithmetic number, because the mean of its divisors is an integer number (31026240).

Almost surely, 2^2017120665 is an apocalyptic number.

It is an amenable number.

2017120665 is a deficient number, since it is larger than the sum of its proper divisors (1954238055).

2017120665 is a wasteful number, since it uses less digits than its factorization.

2017120665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 2017120665 is about 44912.3665041155. The cubic root of 2017120665 is about 1263.5059543169.

Adding to 2017120665 its reverse (5660217102), we get a palindrome (7677337767).

The spelling of 2017120665 in words is "two billion, seventeen million, one hundred twenty thousand, six hundred sixty-five".