26544644261 has 4 divisors (see below), whose sum is σ = 26544972300. Its totient is φ = 26544316224.

The previous prime is 26544644251. The next prime is 26544644267. The reversal of 26544644261 is 16244644562.

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 12408623236 + 14136021025 = 111394^2 + 118895^2 .

It is a cyclic number.

It is not a de Polignac number, because 26544644261 - 2⁶ = 26544644197 is a prime.

It is a super-2 number, since 2×26544644261² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26544644267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53645 + ... + 236573.

It is an arithmetic number, because the mean of its divisors is an integer number (6636243075).

Almost surely, 2^26544644261 is an apocalyptic number.

It is an amenable number.

26544644261 is a deficient number, since it is larger than the sum of its proper divisors (328039).

26544644261 is a wasteful number, since it uses less digits than its factorization.

26544644261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328038.

The product of its digits is 1105920, while the sum is 44.

The spelling of 26544644261 in words is "twenty-six billion, five hundred forty-four million, six hundred forty-four thousand, two hundred sixty-one".