2866665121 has 4 divisors (see below), whose sum is σ = 2871002644. Its totient is φ = 2862327600.

The previous prime is 2866665119. The next prime is 2866665161. The reversal of 2866665121 is 1215666682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1968164496 + 898500625 = 44364^2 + 29975^2 .

It is a cyclic number.

It is not a de Polignac number, because 2866665121 - 2¹ = 2866665119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2866665161) 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, 2167770 + ... + 2169091.

It is an arithmetic number, because the mean of its divisors is an integer number (717750661).

Almost surely, 2^2866665121 is an apocalyptic number.

It is an amenable number.

2866665121 is a deficient number, since it is larger than the sum of its proper divisors (4337523).

2866665121 is an equidigital number, since it uses as much as digits as its factorization.

2866665121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337522.

The product of its digits is 207360, while the sum is 43.

The square root of 2866665121 is about 53541.2469130109. The cubic root of 2866665121 is about 1420.5580562964.

The spelling of 2866665121 in words is "two billion, eight hundred sixty-six million, six hundred sixty-five thousand, one hundred twenty-one".