26518699436161 has 27 divisors (see below), whose sum is σ = 27898374862953. Its totient is φ = 25205177907360.

The previous prime is 26518699436149. The next prime is 26518699436189. The reversal of 26518699436161 is 16163499681562.

The square root of 26518699436161 is 5149631.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 4259703849025 + 22258995587136 = 2063905^2 + 4717944^2 .

It is not a de Polignac number, because 26518699436161 - 2¹¹ = 26518699434113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26518699436111) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 21437913235 + ... + 21437914471.

Almost surely, 2^{26518699436161} is an apocalyptic number.

26518699436161 is the 5149631-st square number.

26518699436161 is the 2574816-th centered octagonal number.

It is an amenable number.

26518699436161 is a deficient number, since it is larger than the sum of its proper divisors (1379675426792).

26518699436161 is an frugal number, since it uses more digits than its factorization.

26518699436161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2882 (or 1441 counting only the distinct ones).

The product of its digits is 100776960, while the sum is 67.

The spelling of 26518699436161 in words is "twenty-six trillion, five hundred eighteen billion, six hundred ninety-nine million, four hundred thirty-six thousand, one hundred sixty-one".