2636761561 has 16 divisors (see below), whose sum is σ = 3160790784. Its totient is φ = 2150590464.

The previous prime is 2636761559. The next prime is 2636761571. The reversal of 2636761561 is 1651676362.

It is a cyclic number.

It is not a de Polignac number, because 2636761561 - 2¹ = 2636761559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2636761531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11356 + ... + 73501.

It is an arithmetic number, because the mean of its divisors is an integer number (197549424).

Almost surely, 2^2636761561 is an apocalyptic number.

It is an amenable number.

2636761561 is a deficient number, since it is larger than the sum of its proper divisors (524029223).

2636761561 is a wasteful number, since it uses less digits than its factorization.

2636761561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85080.

The product of its digits is 272160, while the sum is 43.

The square root of 2636761561 is about 51349.4066275356. The cubic root of 2636761561 is about 1381.5192889072.

The spelling of 2636761561 in words is "two billion, six hundred thirty-six million, seven hundred sixty-one thousand, five hundred sixty-one".