26945681591929 has 9 divisors (see below), whose sum is σ = 27004544948847. Its totient is φ = 26886946298184.

The previous prime is 26945681591921. The next prime is 26945681591963. The reversal of 26945681591929 is 92919518654962.

It is a happy number.

The square root of 26945681591929 is 5190923.

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

It can be written as a sum of positive squares in only one way, i.e., 5747502786025 + 21198178805904 = 2397395^2 + 4604148^2 .

It is not a de Polignac number, because 26945681591929 - 2³ = 26945681591921 is a prime.

It is a super-3 number, since 3×26945681591929³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26945681591921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2486446699 + ... + 2486457535.

Almost surely, 2^{26945681591929} is an apocalyptic number.

26945681591929 is the 5190923-rd square number.

26945681591929 is the 2595462-nd centered octagonal number.

It is an amenable number.

26945681591929 is a deficient number, since it is larger than the sum of its proper divisors (58863356918).

26945681591929 is an frugal number, since it uses more digits than its factorization.

26945681591929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22632 (or 11316 counting only the distinct ones).

The product of its digits is 755827200, while the sum is 76.

The spelling of 26945681591929 in words is "twenty-six trillion, nine hundred forty-five billion, six hundred eighty-one million, five hundred ninety-one thousand, nine hundred twenty-nine".