26505253881 has 12 divisors (see below), whose sum is σ = 39320106852. Its totient is φ = 17192596896.

The previous prime is 26505253867. The next prime is 26505253909. The reversal of 26505253881 is 18835250562.

26505253881 is a `hidden beast` number, since 2 + 65 + 0 + 52 + 538 + 8 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9044010000 + 17461243881 = 95100^2 + 132141^2 .

It is not a de Polignac number, because 26505253881 - 2¹¹ = 26505251833 is a prime.

It is a super-2 number, since 2×26505253881² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (26505253081) 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, 39797346 + ... + 39798011.

It is an arithmetic number, because the mean of its divisors is an integer number (3276675571).

Almost surely, 2^26505253881 is an apocalyptic number.

It is an amenable number.

26505253881 is a deficient number, since it is larger than the sum of its proper divisors (12814852971).

26505253881 is a wasteful number, since it uses less digits than its factorization.

26505253881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79595400 (or 79595397 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 26505253881 in words is "twenty-six billion, five hundred five million, two hundred fifty-three thousand, eight hundred eighty-one".