2666330261 has 4 divisors (see below), whose sum is σ = 3047234592. Its totient is φ = 2285425932.

The previous prime is 2666330221. The next prime is 2666330273. The reversal of 2666330261 is 1620336662.

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 a de Polignac number, because none of the positive numbers 2^k-2666330261 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 (2666330221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 190452155 + ... + 190452168.

It is an arithmetic number, because the mean of its divisors is an integer number (761808648).

Almost surely, 2^2666330261 is an apocalyptic number.

It is an amenable number.

2666330261 is a deficient number, since it is larger than the sum of its proper divisors (380904331).

2666330261 is an equidigital number, since it uses as much as digits as its factorization.

2666330261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380904330.

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 2666330261 is about 51636.5206128376. The cubic root of 2666330261 is about 1386.6642335836.

The spelling of 2666330261 in words is "two billion, six hundred sixty-six million, three hundred thirty thousand, two hundred sixty-one".