2776461561 has 6 divisors (see below), whose sum is σ = 4010444490. Its totient is φ = 1850974368.

The previous prime is 2776461559. The next prime is 2776461563. The reversal of 2776461561 is 1651646772.

2776461561 is a `hidden beast` number, since 27 + 7 + 6 + 4 + 61 + 561 = 666.

It is an interprime number because it is at equal distance from previous prime (2776461559) and next prime (2776461563).

It can be written as a sum of positive squares in only one way, i.e., 2775182400 + 1279161 = 52680^2 + 1131^2 .

It is not a de Polignac number, because 2776461561 - 2¹ = 2776461559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2776461563) 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 in 5 ways as a sum of consecutive naturals, for example, 154247856 + ... + 154247873.

It is an arithmetic number, because the mean of its divisors is an integer number (668407415).

Almost surely, 2^2776461561 is an apocalyptic number.

It is an amenable number.

2776461561 is a deficient number, since it is larger than the sum of its proper divisors (1233982929).

2776461561 is a wasteful number, since it uses less digits than its factorization.

2776461561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308495735 (or 308495732 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 2776461561 is about 52692.1394612138. The cubic root of 2776461561 is about 1405.4990457136.

The spelling of 2776461561 in words is "two billion, seven hundred seventy-six million, four hundred sixty-one thousand, five hundred sixty-one".