2772868621 has 2 divisors, whose sum is σ = 2772868622. Its totient is φ = 2772868620.

The previous prime is 2772868619. The next prime is 2772868627. The reversal of 2772868621 is 1268682772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1883994025 + 888874596 = 43405^2 + 29814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2772868621 - 2¹ = 2772868619 is a prime.

Together with 2772868619, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2772868627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1386434310 + 1386434311.

It is an arithmetic number, because the mean of its divisors is an integer number (1386434311).

Almost surely, 2^2772868621 is an apocalyptic number.

It is an amenable number.

2772868621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2772868621 is an equidigital number, since it uses as much as digits as its factorization.

2772868621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 903168, while the sum is 49.

The square root of 2772868621 is about 52658.0347240571. The cubic root of 2772868621 is about 1404.8925118818.

The spelling of 2772868621 in words is "two billion, seven hundred seventy-two million, eight hundred sixty-eight thousand, six hundred twenty-one".