2665340909 has 32 divisors (see below), whose sum is σ = 3437199360. Its totient is φ = 2005804800.

The previous prime is 2665340897. The next prime is 2665340929. The reversal of 2665340909 is 9090435662.

It is a cyclic number.

It is not a de Polignac number, because 2665340909 - 2²⁰ = 2664292333 is a prime.

It is a super-2 number, since 2×2665340909² = 14208084322377892562, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 2665340909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665340929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1715477 + ... + 1717029.

It is an arithmetic number, because the mean of its divisors is an integer number (107412480).

Almost surely, 2^2665340909 is an apocalyptic number.

It is an amenable number.

2665340909 is a deficient number, since it is larger than the sum of its proper divisors (771858451).

2665340909 is a wasteful number, since it uses less digits than its factorization.

2665340909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2321.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 2665340909 is about 51626.9397601678. The cubic root of 2665340909 is about 1386.4927033508.

The spelling of 2665340909 in words is "two billion, six hundred sixty-five million, three hundred forty thousand, nine hundred nine".