26239788169 has 27 divisors (see below), whose sum is σ = 31045632597. Its totient is φ = 22113169344.

The previous prime is 26239788137. The next prime is 26239788191. The reversal of 26239788169 is 96188793262.

The square root of 26239788169 is 161987.

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 5567099769 + 20672688400 = 74613^2 + 143780^2 .

It is not a de Polignac number, because 26239788169 - 2⁵ = 26239788137 is a prime.

It is a super-2 number, since 2×26239788169² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26239788199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 82775199 + ... + 82775515.

Almost surely, 2^26239788169 is an apocalyptic number.

26239788169 is the 161987-th square number.

26239788169 is the 80994-th centered octagonal number.

It is an amenable number.

26239788169 is a deficient number, since it is larger than the sum of its proper divisors (4805844428).

26239788169 is an frugal number, since it uses more digits than its factorization.

26239788169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 397 counting only the distinct ones).

The product of its digits is 15676416, while the sum is 61.

The spelling of 26239788169 in words is "twenty-six billion, two hundred thirty-nine million, seven hundred eighty-eight thousand, one hundred sixty-nine".