26685387783809 has 8 divisors (see below), whose sum is σ = 26921706697512. Its totient is φ = 26449071765760.

The previous prime is 26685387783781. The next prime is 26685387783823. The reversal of 26685387783809 is 90838778358662.

It can be written as a sum of positive squares in 4 ways, for example, as 1038303936784 + 25647083847025 = 1018972^2 + 5064295^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 26685387783809 - 2¹⁶ = 26685387718273 is a prime.

It is a super-2 number, since 2×26685387783809² (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 (26685387783889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20542979 + ... + 21803319.

It is an arithmetic number, because the mean of its divisors is an integer number (3365213337189).

Almost surely, 2^{26685387783809} is an apocalyptic number.

It is an amenable number.

26685387783809 is a deficient number, since it is larger than the sum of its proper divisors (236318913703).

26685387783809 is a wasteful number, since it uses less digits than its factorization.

26685387783809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447827.

The product of its (nonzero) digits is 5852528640, while the sum is 80.

The spelling of 26685387783809 in words is "twenty-six trillion, six hundred eighty-five billion, three hundred eighty-seven million, seven hundred eighty-three thousand, eight hundred nine".