2777966561 has 4 divisors (see below), whose sum is σ = 2825050800. Its totient is φ = 2730882324.

The previous prime is 2777966551. The next prime is 2777966593. The reversal of 2777966561 is 1656697772.

2777966561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2777966561 - 2¹⁸ = 2777704417 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2777966497 and 2777966506.

It is not an unprimeable number, because it can be changed into a prime (2777966501) 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, 23542031 + ... + 23542148.

It is an arithmetic number, because the mean of its divisors is an integer number (706262700).

Almost surely, 2^2777966561 is an apocalyptic number.

It is an amenable number.

2777966561 is a deficient number, since it is larger than the sum of its proper divisors (47084239).

2777966561 is an equidigital number, since it uses as much as digits as its factorization.

2777966561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47084238.

The product of its digits is 6667920, while the sum is 56.

The square root of 2777966561 is about 52706.4185939436. The cubic root of 2777966561 is about 1405.7529533021.

The spelling of 2777966561 in words is "two billion, seven hundred seventy-seven million, nine hundred sixty-six thousand, five hundred sixty-one".