26943397634209 has 27 divisors (see below), whose sum is σ = 31467632156793. Its totient is φ = 23002371953568.

The previous prime is 26943397634161. The next prime is 26943397634249. The reversal of 26943397634209 is 90243679334962.

The square root of 26943397634209 is 5190703.

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 19222112795809 + 7721284838400 = 4384303^2 + 2778720^2 .

It is not a de Polignac number, because 26943397634209 - 2¹¹ = 26943397632161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (26943397634249) 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, 10064771779 + ... + 10064774455.

It is an arithmetic number, because the mean of its divisors is an integer number (1165467857659).

Almost surely, 2^{26943397634209} is an apocalyptic number.

26943397634209 is the 5190703-rd square number.

26943397634209 is the 2595352-nd centered octagonal number.

It is an amenable number.

26943397634209 is a deficient number, since it is larger than the sum of its proper divisors (4524234522584).

26943397634209 is an frugal number, since it uses more digits than its factorization.

26943397634209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5922 (or 2961 counting only the distinct ones).

The product of its (nonzero) digits is 317447424, while the sum is 67.

The spelling of 26943397634209 in words is "twenty-six trillion, nine hundred forty-three billion, three hundred ninety-seven million, six hundred thirty-four thousand, two hundred nine".