27724785317 has 2 divisors, whose sum is σ = 27724785318. Its totient is φ = 27724785316.

The previous prime is 27724785311. The next prime is 27724785343. The reversal of 27724785317 is 71358742772.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22366398916 + 5358386401 = 149554^2 + 73201^2 .

It is a cyclic number.

It is not a de Polignac number, because 27724785317 - 2²² = 27720591013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27724785311) 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 as a sum of consecutive naturals, namely, 13862392658 + 13862392659.

It is an arithmetic number, because the mean of its divisors is an integer number (13862392659).

Almost surely, 2^27724785317 is an apocalyptic number.

It is an amenable number.

27724785317 is a deficient number, since it is larger than the sum of its proper divisors (1).

27724785317 is an equidigital number, since it uses as much as digits as its factorization.

27724785317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4609920, while the sum is 53.

The spelling of 27724785317 in words is "twenty-seven billion, seven hundred twenty-four million, seven hundred eighty-five thousand, three hundred seventeen".