26205458161 has 3 divisors (see below), whose sum is σ = 26205620043. Its totient is φ = 26205296280.

The previous prime is 26205458159. The next prime is 26205458173. The reversal of 26205458161 is 16185450262.

The square root of 26205458161 is 161881.

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

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 only one way, i.e., 323761 + 26205134400 = 569^2 + 161880^2 .

It is not a de Polignac number, because 26205458161 - 2¹ = 26205458159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26205458561) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 80941 + ... + 242821.

It is an arithmetic number, because the mean of its divisors is an integer number (8735206681).

Almost surely, 2^26205458161 is an apocalyptic number.

26205458161 is the 161881-st square number.

26205458161 is the 80941-st centered octagonal number.

It is an amenable number.

26205458161 is a deficient number, since it is larger than the sum of its proper divisors (161882).

26205458161 is an frugal number, since it uses more digits than its factorization.

26205458161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323762 (or 161881 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The spelling of 26205458161 in words is "twenty-six billion, two hundred five million, four hundred fifty-eight thousand, one hundred sixty-one".