2115161065 has 4 divisors (see below), whose sum is σ = 2538193284. Its totient is φ = 1692128848.

The previous prime is 2115161051. The next prime is 2115161077. The reversal of 2115161065 is 5601615112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 301508496 + 1813652569 = 17364^2 + 42587^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115161065 - 2¹¹ = 2115159017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211516102 + ... + 211516111.

It is an arithmetic number, because the mean of its divisors is an integer number (634548321).

Almost surely, 2^2115161065 is an apocalyptic number.

It is an amenable number.

2115161065 is a deficient number, since it is larger than the sum of its proper divisors (423032219).

2115161065 is an equidigital number, since it uses as much as digits as its factorization.

2115161065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423032218.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 2115161065 is about 45990.8802372818. The cubic root of 2115161065 is about 1283.6535154702.

Adding to 2115161065 its reverse (5601615112), we get a palindrome (7716776177).

The spelling of 2115161065 in words is "two billion, one hundred fifteen million, one hundred sixty-one thousand, sixty-five".