26260235565561 has 56 divisors (see below), whose sum is σ = 39562237793280. Its totient is φ = 17422587063936.

The previous prime is 26260235565547. The next prime is 26260235565607. The reversal of 26260235565561 is 16556553206262.

26260235565561 is a `hidden beast` number, since 2 + 6 + 2 + 6 + 0 + 2 + 35 + 56 + 556 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-26260235565561 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 26260235565498 and 26260235565507.

It is not an unprimeable number, because it can be changed into a prime (26260235565461) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 128050641 + ... + 128255553.

Almost surely, 2^{26260235565561} is an apocalyptic number.

It is an amenable number.

26260235565561 is a deficient number, since it is larger than the sum of its proper divisors (13302002227719).

26260235565561 is an equidigital number, since it uses as much as digits as its factorization.

26260235565561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205777 (or 205762 counting only the distinct ones).

The product of its (nonzero) digits is 19440000, while the sum is 54.

The spelling of 26260235565561 in words is "twenty-six trillion, two hundred sixty billion, two hundred thirty-five million, five hundred sixty-five thousand, five hundred sixty-one".