2561775855 has 8 divisors (see below), whose sum is σ = 4098841392. Its totient is φ = 1366280448.

The previous prime is 2561775851. The next prime is 2561775889. The reversal of 2561775855 is 5585771652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2561775855 - 2² = 2561775851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2561775798 and 2561775807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2561775851) 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 7 ways as a sum of consecutive naturals, for example, 85392514 + ... + 85392543.

It is an arithmetic number, because the mean of its divisors is an integer number (512355174).

Almost surely, 2^2561775855 is an apocalyptic number.

2561775855 is a deficient number, since it is larger than the sum of its proper divisors (1537065537).

2561775855 is a wasteful number, since it uses less digits than its factorization.

2561775855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170785065.

The product of its digits is 2940000, while the sum is 51.

The square root of 2561775855 is about 50613.9887284138. The cubic root of 2561775855 is about 1368.2970039489.

The spelling of 2561775855 in words is "two billion, five hundred sixty-one million, seven hundred seventy-five thousand, eight hundred fifty-five".