26391250055 has 4 divisors (see below), whose sum is σ = 31669500072. Its totient is φ = 21113000040.

The previous prime is 26391250051. The next prime is 26391250069. The reversal of 26391250055 is 55005219362.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55005219362 = 2 ⋅27502609681.

It is not a de Polignac number, because 26391250055 - 2² = 26391250051 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26391250051) 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 3 ways as a sum of consecutive naturals, for example, 2639125001 + ... + 2639125010.

It is an arithmetic number, because the mean of its divisors is an integer number (7917375018).

Almost surely, 2^26391250055 is an apocalyptic number.

26391250055 is a deficient number, since it is larger than the sum of its proper divisors (5278250017).

26391250055 is an equidigital number, since it uses as much as digits as its factorization.

26391250055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5278250016.

The product of its (nonzero) digits is 81000, while the sum is 38.

The spelling of 26391250055 in words is "twenty-six billion, three hundred ninety-one million, two hundred fifty thousand, fifty-five".