26056455561 has 12 divisors (see below), whose sum is σ = 38347237188. Its totient is φ = 17043215904.

The previous prime is 26056455553. The next prime is 26056455563. The reversal of 26056455561 is 16555465062.

26056455561 is a `hidden beast` number, since 2 + 6 + 0 + 56 + 45 + 556 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 23361288336 + 2695167225 = 152844^2 + 51915^2 .

It is not a de Polignac number, because 26056455561 - 2³ = 26056455553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26056455563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27312370 + ... + 27313323.

It is an arithmetic number, because the mean of its divisors is an integer number (3195603099).

Almost surely, 2^26056455561 is an apocalyptic number.

It is an amenable number.

26056455561 is a deficient number, since it is larger than the sum of its proper divisors (12290781627).

26056455561 is a wasteful number, since it uses less digits than its factorization.

26056455561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54625752 (or 54625749 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 45.

The spelling of 26056455561 in words is "twenty-six billion, fifty-six million, four hundred fifty-five thousand, five hundred sixty-one".