26258126621 has 4 divisors (see below), whose sum is σ = 26258458044. Its totient is φ = 26257795200.

The previous prime is 26258126549. The next prime is 26258126623. The reversal of 26258126621 is 12662185262.

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 520341721 + 25737784900 = 22811^2 + 160430^2 .

It is a cyclic number.

It is not a de Polignac number, because 26258126621 - 2¹⁴ = 26258110237 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26258126623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30851 + ... + 231231.

It is an arithmetic number, because the mean of its divisors is an integer number (6564614511).

Almost surely, 2^26258126621 is an apocalyptic number.

It is an amenable number.

26258126621 is a deficient number, since it is larger than the sum of its proper divisors (331423).

26258126621 is a wasteful number, since it uses less digits than its factorization.

26258126621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331422.

The product of its digits is 138240, while the sum is 41.

The spelling of 26258126621 in words is "twenty-six billion, two hundred fifty-eight million, one hundred twenty-six thousand, six hundred twenty-one".