27800561843 has 4 divisors (see below), whose sum is σ = 27800895408. Its totient is φ = 27800228280.

The previous prime is 27800561821. The next prime is 27800561849. The reversal of 27800561843 is 34816500872.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27800561843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27800561794 and 27800561803.

It is not an unprimeable number, because it can be changed into a prime (27800561849) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77453 + ... + 248193.

It is an arithmetic number, because the mean of its divisors is an integer number (6950223852).

Almost surely, 2^27800561843 is an apocalyptic number.

27800561843 is a deficient number, since it is larger than the sum of its proper divisors (333565).

27800561843 is a wasteful number, since it uses less digits than its factorization.

27800561843 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333564.

The product of its (nonzero) digits is 322560, while the sum is 44.

The spelling of 27800561843 in words is "twenty-seven billion, eight hundred million, five hundred sixty-one thousand, eight hundred forty-three".