26181284065225 has 9 divisors (see below), whose sum is σ = 32464823964853. Its totient is φ = 20945006785120.

The previous prime is 26181284065163. The next prime is 26181284065253. The reversal of 26181284065225 is 52256048218162.

The square root of 26181284065225 is 5116765.

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 1917817831609 + 24263466233616 = 1384853^2 + 4925796^2 .

It is not a de Polignac number, because 26181284065225 - 2²¹ = 26181281968073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25072149 + ... + 26095501.

Almost surely, 2^{26181284065225} is an apocalyptic number.

26181284065225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

26181284065225 is the 5116765-th square number.

26181284065225 is the 2558383-rd centered octagonal number.

It is an amenable number.

26181284065225 is a deficient number, since it is larger than the sum of its proper divisors (6283539899628).

26181284065225 is an frugal number, since it uses more digits than its factorization.

26181284065225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046716 (or 1023358 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 52.

The spelling of 26181284065225 in words is "twenty-six trillion, one hundred eighty-one billion, two hundred eighty-four million, sixty-five thousand, two hundred twenty-five".