2661130165 has 4 divisors (see below), whose sum is σ = 3193356204. Its totient is φ = 2128904128.

The previous prime is 2661130141. The next prime is 2661130189. The reversal of 2661130165 is 5610311662.

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

It is an interprime number because it is at equal distance from previous prime (2661130141) and next prime (2661130189).

It can be written as a sum of positive squares in 2 ways, for example, as 756855121 + 1904275044 = 27511^2 + 43638^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661130165 - 2¹³ = 2661121973 is a prime.

It is a super-2 number, since 2×2661130165² = 14163227510145854450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent 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, 266113012 + ... + 266113021.

It is an arithmetic number, because the mean of its divisors is an integer number (798339051).

Almost surely, 2^2661130165 is an apocalyptic number.

It is an amenable number.

2661130165 is a deficient number, since it is larger than the sum of its proper divisors (532226039).

2661130165 is an equidigital number, since it uses as much as digits as its factorization.

2661130165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532226038.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 2661130165 is about 51586.1431491055. The cubic root of 2661130165 is about 1385.7621847995.

The spelling of 2661130165 in words is "two billion, six hundred sixty-one million, one hundred thirty thousand, one hundred sixty-five".