2666342261 has 4 divisors (see below), whose sum is σ = 2908737024. Its totient is φ = 2423947500.

The previous prime is 2666342249. The next prime is 2666342291. The reversal of 2666342261 is 1622436662.

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 2666342261 - 2²⁶ = 2599233397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666342221) 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, 121197365 + ... + 121197386.

It is an arithmetic number, because the mean of its divisors is an integer number (727184256).

Almost surely, 2^2666342261 is an apocalyptic number.

It is an amenable number.

2666342261 is a deficient number, since it is larger than the sum of its proper divisors (242394763).

2666342261 is a wasteful number, since it uses less digits than its factorization.

2666342261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242394762.

The product of its digits is 124416, while the sum is 38.

The square root of 2666342261 is about 51636.6368095367. The cubic root of 2666342261 is about 1386.6663138392. Note that the first 3 decimals are identical.

The spelling of 2666342261 in words is "two billion, six hundred sixty-six million, three hundred forty-two thousand, two hundred sixty-one".