27800718455 has 4 divisors (see below), whose sum is σ = 33360862152. Its totient is φ = 22240574760.

The previous prime is 27800718397. The next prime is 27800718457. The reversal of 27800718455 is 55481700872.

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

It is not a de Polignac number, because 27800718455 - 2¹⁰ = 27800717431 is a prime.

It is a super-2 number, since 2×27800718455² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27800718457) by changing a digit.

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, 2780071841 + ... + 2780071850.

It is an arithmetic number, because the mean of its divisors is an integer number (8340215538).

Almost surely, 2^27800718455 is an apocalyptic number.

27800718455 is a deficient number, since it is larger than the sum of its proper divisors (5560143697).

27800718455 is an equidigital number, since it uses as much as digits as its factorization.

27800718455 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5560143696.

The product of its (nonzero) digits is 627200, while the sum is 47.

The spelling of 27800718455 in words is "twenty-seven billion, eight hundred million, seven hundred eighteen thousand, four hundred fifty-five".