27721065413 has 2 divisors, whose sum is σ = 27721065414. Its totient is φ = 27721065412.

The previous prime is 27721065401. The next prime is 27721065451. The reversal of 27721065413 is 31456012772.

It is an a-pointer prime, because the next prime (27721065451) can be obtained adding 27721065413 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15391627969 + 12329437444 = 124063^2 + 111038^2 .

It is a cyclic number.

It is not a de Polignac number, because 27721065413 - 2⁶ = 27721065349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27721065913) 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 as a sum of consecutive naturals, namely, 13860532706 + 13860532707.

It is an arithmetic number, because the mean of its divisors is an integer number (13860532707).

Almost surely, 2^27721065413 is an apocalyptic number.

It is an amenable number.

27721065413 is a deficient number, since it is larger than the sum of its proper divisors (1).

27721065413 is an equidigital number, since it uses as much as digits as its factorization.

27721065413 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 70560, while the sum is 38.

The spelling of 27721065413 in words is "twenty-seven billion, seven hundred twenty-one million, sixty-five thousand, four hundred thirteen".