27818894065 has 4 divisors (see below), whose sum is σ = 33382672884. Its totient is φ = 22255115248.

The previous prime is 27818893979. The next prime is 27818894069. The reversal of 27818894065 is 56049881872.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 20143557184 + 7675336881 = 141928^2 + 87609^2 .

It is a cyclic number.

It is not a de Polignac number, because 27818894065 - 2¹³ = 27818885873 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27818894069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2781889402 + ... + 2781889411.

It is an arithmetic number, because the mean of its divisors is an integer number (8345668221).

Almost surely, 2^27818894065 is an apocalyptic number.

It is an amenable number.

27818894065 is a deficient number, since it is larger than the sum of its proper divisors (5563778819).

27818894065 is an equidigital number, since it uses as much as digits as its factorization.

27818894065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5563778818.

The product of its (nonzero) digits is 7741440, while the sum is 58.

The spelling of 27818894065 in words is "twenty-seven billion, eight hundred eighteen million, eight hundred ninety-four thousand, sixty-five".