26317781755 has 4 divisors (see below), whose sum is σ = 31581338112. Its totient is φ = 21054225400.

The previous prime is 26317781747. The next prime is 26317781779. The reversal of 26317781755 is 55718771362.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 26317781755 - 2³ = 26317781747 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2631778171 + ... + 2631778180.

It is an arithmetic number, because the mean of its divisors is an integer number (7895334528).

Almost surely, 2^26317781755 is an apocalyptic number.

26317781755 is a deficient number, since it is larger than the sum of its proper divisors (5263556357).

26317781755 is an equidigital number, since it uses as much as digits as its factorization.

26317781755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263556356.

The product of its digits is 2469600, while the sum is 52.

The spelling of 26317781755 in words is "twenty-six billion, three hundred seventeen million, seven hundred eighty-one thousand, seven hundred fifty-five".