26206325521 has 4 divisors (see below), whose sum is σ = 26206654500. Its totient is φ = 26205996544.

The previous prime is 26206325507. The next prime is 26206325539. The reversal of 26206325521 is 12552360262.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 21414224896 + 4792100625 = 146336^2 + 69225^2 .

It is a cyclic number.

It is not a de Polignac number, because 26206325521 - 2⁹ = 26206325009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26206325221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38505 + ... + 232153.

It is an arithmetic number, because the mean of its divisors is an integer number (6551663625).

Almost surely, 2^26206325521 is an apocalyptic number.

It is an amenable number.

26206325521 is a deficient number, since it is larger than the sum of its proper divisors (328979).

26206325521 is a wasteful number, since it uses less digits than its factorization.

26206325521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328978.

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 26206325521 its reverse (12552360262), we get a palindrome (38758685783).

The spelling of 26206325521 in words is "twenty-six billion, two hundred six million, three hundred twenty-five thousand, five hundred twenty-one".