2665261117 has 4 divisors (see below), whose sum is σ = 2665389280. Its totient is φ = 2665132956.

The previous prime is 2665261097. The next prime is 2665261121. The reversal of 2665261117 is 7111625662.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2665261117 - 2²³ = 2656872509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665261147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24903 + ... + 77140.

It is an arithmetic number, because the mean of its divisors is an integer number (666347320).

Almost surely, 2^2665261117 is an apocalyptic number.

It is an amenable number.

2665261117 is a deficient number, since it is larger than the sum of its proper divisors (128163).

2665261117 is a wasteful number, since it uses less digits than its factorization.

2665261117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128162.

The product of its digits is 30240, while the sum is 37.

The square root of 2665261117 is about 51626.1669795463. The cubic root of 2665261117 is about 1386.4788674560.

Adding to 2665261117 its reverse (7111625662), we get a palindrome (9776886779).

The spelling of 2665261117 in words is "two billion, six hundred sixty-five million, two hundred sixty-one thousand, one hundred seventeen".