2665463066221 has 4 divisors (see below), whose sum is σ = 2665467320572. Its totient is φ = 2665458811872.

The previous prime is 2665463066209. The next prime is 2665463066261. The reversal of 2665463066221 is 1226603645662.

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 2160858840196 + 504604226025 = 1469986^2 + 710355^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665463066221 - 2²¹ = 2665460969069 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 (2665463066261) 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, 981816 + ... + 2508961.

It is an arithmetic number, because the mean of its divisors is an integer number (666366830143).

Almost surely, 2^{2665463066221} is an apocalyptic number.

It is an amenable number.

2665463066221 is a deficient number, since it is larger than the sum of its proper divisors (4254351).

2665463066221 is an equidigital number, since it uses as much as digits as its factorization.

2665463066221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4254350.

The product of its (nonzero) digits is 3732480, while the sum is 49.

The spelling of 2665463066221 in words is "two trillion, six hundred sixty-five billion, four hundred sixty-three million, sixty-six thousand, two hundred twenty-one".