2101165065 has 96 divisors (see below), whose sum is σ = 4169992320. Its totient is φ = 971937792.

The previous prime is 2101165063. The next prime is 2101165081. The reversal of 2101165065 is 5605611012.

It is a happy number.

2101165065 is a `hidden beast` number, since 2 + 1 + 0 + 1 + 1 + 650 + 6 + 5 = 666.

It is not a de Polignac number, because 2101165065 - 2¹ = 2101165063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2101165061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 535842 + ... + 539748.

It is an arithmetic number, because the mean of its divisors is an integer number (43437420).

Almost surely, 2^2101165065 is an apocalyptic number.

It is an amenable number.

2101165065 is a deficient number, since it is larger than the sum of its proper divisors (2068827255).

2101165065 is a wasteful number, since it uses less digits than its factorization.

2101165065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3991 (or 3988 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 2101165065 is about 45838.4670882437. The cubic root of 2101165065 is about 1280.8159399305.

Adding to 2101165065 its reverse (5605611012), we get a palindrome (7706776077).

The spelling of 2101165065 in words is "two billion, one hundred one million, one hundred sixty-five thousand, sixty-five".