2566776649 has 2 divisors, whose sum is σ = 2566776650. Its totient is φ = 2566776648.

The previous prime is 2566776629. The next prime is 2566776679. The reversal of 2566776649 is 9466776652.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2003189049 + 563587600 = 44757^2 + 23740^2 .

It is a cyclic number.

It is not a de Polignac number, because 2566776649 - 2²¹ = 2564679497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2566776593 and 2566776602.

It is not a weakly prime, because it can be changed into another prime (2566776629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1283388324 + 1283388325.

It is an arithmetic number, because the mean of its divisors is an integer number (1283388325).

Almost surely, 2^2566776649 is an apocalyptic number.

It is an amenable number.

2566776649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2566776649 is an equidigital number, since it uses as much as digits as its factorization.

2566776649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 58.

The square root of 2566776649 is about 50663.3659462140. The cubic root of 2566776649 is about 1369.1867674358.

The spelling of 2566776649 in words is "two billion, five hundred sixty-six million, seven hundred seventy-six thousand, six hundred forty-nine".