26921405569 has 4 divisors (see below), whose sum is σ = 26931331396. Its totient is φ = 26911479744.

The previous prime is 26921405549. The next prime is 26921405573. The reversal of 26921405569 is 96550412962.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96550412962 = 2 ⋅48275206481.

It can be written as a sum of positive squares in 2 ways, for example, as 23959324944 + 2962080625 = 154788^2 + 54425^2 .

It is a cyclic number.

It is not a de Polignac number, because 26921405569 - 2¹¹ = 26921403521 is a prime.

It is a super-2 number, since 2×26921405569² (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 (26921405519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4958844 + ... + 4964269.

It is an arithmetic number, because the mean of its divisors is an integer number (6732832849).

Almost surely, 2^26921405569 is an apocalyptic number.

It is an amenable number.

26921405569 is a deficient number, since it is larger than the sum of its proper divisors (9925827).

26921405569 is an equidigital number, since it uses as much as digits as its factorization.

26921405569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9925826.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 26921405569 in words is "twenty-six billion, nine hundred twenty-one million, four hundred five thousand, five hundred sixty-nine".