26639853827161 has 3 divisors (see below), whose sum is σ = 26639858988543. Its totient is φ = 26639848665780.

The previous prime is 26639853827107. The next prime is 26639853827173. The reversal of 26639853827161 is 16172835893662.

The square root of 26639853827161 is 5161381.

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., 11392859359561 + 15246994467600 = 3375331^2 + 3904740^2 .

It is not a de Polignac number, because 26639853827161 - 2¹¹ = 26639853825113 is a prime.

It is a super-2 number, since 2×26639853827161² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26639853827761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2580691 + ... + 7742071.

It is an arithmetic number, because the mean of its divisors is an integer number (8879952996181).

Almost surely, 2^{26639853827161} is an apocalyptic number.

26639853827161 is the 5161381-st square number.

26639853827161 is the 2580691-st centered octagonal number.

It is an amenable number.

26639853827161 is a deficient number, since it is larger than the sum of its proper divisors (5161382).

26639853827161 is an frugal number, since it uses more digits than its factorization.

26639853827161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10322762 (or 5161381 counting only the distinct ones).

The product of its digits is 156764160, while the sum is 67.

The spelling of 26639853827161 in words is "twenty-six trillion, six hundred thirty-nine billion, eight hundred fifty-three million, eight hundred twenty-seven thousand, one hundred sixty-one".