2772728561 has 2 divisors, whose sum is σ = 2772728562. Its totient is φ = 2772728560.

The previous prime is 2772728527. The next prime is 2772728579. The reversal of 2772728561 is 1658272772.

2772728561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2389352161 + 383376400 = 48881^2 + 19580^2 .

It is a cyclic number.

It is not a de Polignac number, because 2772728561 - 2¹⁴ = 2772712177 is a prime.

It is not a weakly prime, because it can be changed into another prime (2772728521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1386364280 + 1386364281.

It is an arithmetic number, because the mean of its divisors is an integer number (1386364281).

Almost surely, 2^2772728561 is an apocalyptic number.

It is an amenable number.

2772728561 is a deficient number, since it is larger than the sum of its proper divisors (1).

2772728561 is an equidigital number, since it uses as much as digits as its factorization.

2772728561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 658560, while the sum is 47.

The square root of 2772728561 is about 52656.7048057510. The cubic root of 2772728561 is about 1404.8688573703.

The spelling of 2772728561 in words is "two billion, seven hundred seventy-two million, seven hundred twenty-eight thousand, five hundred sixty-one".