27827833971409 has 2 divisors, whose sum is σ = 27827833971410. Its totient is φ = 27827833971408.

The previous prime is 27827833971407. The next prime is 27827833971433. The reversal of 27827833971409 is 90417933872872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26738413646400 + 1089420325009 = 5170920^2 + 1043753^2 .

It is a cyclic number.

It is not a de Polignac number, because 27827833971409 - 2¹ = 27827833971407 is a prime.

Together with 27827833971407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (27827833971401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13913916985704 + 13913916985705.

It is an arithmetic number, because the mean of its divisors is an integer number (13913916985705).

Almost surely, 2^{27827833971409} is an apocalyptic number.

It is an amenable number.

27827833971409 is a deficient number, since it is larger than the sum of its proper divisors (1).

27827833971409 is an equidigital number, since it uses as much as digits as its factorization.

27827833971409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256048128, while the sum is 70.

The spelling of 27827833971409 in words is "twenty-seven trillion, eight hundred twenty-seven billion, eight hundred thirty-three million, nine hundred seventy-one thousand, four hundred nine".