2776555649 has 6 divisors (see below), whose sum is σ = 3229870914. Its totient is φ = 2379904800.

The previous prime is 2776555631. The next prime is 2776555681. The reversal of 2776555649 is 9465556772.

It can be written as a sum of positive squares in only one way, i.e., 1691841424 + 1084714225 = 41132^2 + 32935^2 .

It is not a de Polignac number, because 2776555649 - 2¹⁶ = 2776490113 is a prime.

It is a super-2 number, since 2×2776555649² = 15418522543987622402, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2776555594 and 2776555603.

It is not an unprimeable number, because it can be changed into a prime (2776555609) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28332152 + ... + 28332249.

It is an arithmetic number, because the mean of its divisors is an integer number (538311819).

Almost surely, 2^2776555649 is an apocalyptic number.

It is an amenable number.

2776555649 is a deficient number, since it is larger than the sum of its proper divisors (453315265).

2776555649 is an equidigital number, since it uses as much as digits as its factorization.

2776555649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56664415 (or 56664408 counting only the distinct ones).

The product of its digits is 15876000, while the sum is 56.

The square root of 2776555649 is about 52693.0322623400. The cubic root of 2776555649 is about 1405.5149219284.

The spelling of 2776555649 in words is "two billion, seven hundred seventy-six million, five hundred fifty-five thousand, six hundred forty-nine".