26891736169 has 3 divisors (see below), whose sum is σ = 26891900157. Its totient is φ = 26891572182.

The previous prime is 26891736097. The next prime is 26891736187. The reversal of 26891736169 is 96163719862.

The square root of 26891736169 is 163987.

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 is not a de Polignac number, because 26891736169 - 2⁹ = 26891735657 is a prime.

It is a super-2 number, since 2×26891736169² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26891734169) 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, 81994 + ... + 245980.

It is an arithmetic number, because the mean of its divisors is an integer number (8963966719).

Almost surely, 2^26891736169 is an apocalyptic number.

26891736169 is the 163987-th square number.

26891736169 is the 81994-th centered octagonal number.

It is an amenable number.

26891736169 is a deficient number, since it is larger than the sum of its proper divisors (163988).

26891736169 is an frugal number, since it uses more digits than its factorization.

26891736169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327974 (or 163987 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 58.

The spelling of 26891736169 in words is "twenty-six billion, eight hundred ninety-one million, seven hundred thirty-six thousand, one hundred sixty-nine".