27320777681 has 2 divisors, whose sum is σ = 27320777682. Its totient is φ = 27320777680.

The previous prime is 27320777651. The next prime is 27320777683. The reversal of 27320777681 is 18677702372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24253390225 + 3067387456 = 155735^2 + 55384^2 .

It is a cyclic number.

It is not a de Polignac number, because 27320777681 - 2¹⁴ = 27320761297 is a prime.

It is a super-2 number, since 2×27320777681² (a number of 22 digits) contains 22 as substring.

Together with 27320777683, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (27320777683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13660388840 + 13660388841.

It is an arithmetic number, because the mean of its divisors is an integer number (13660388841).

Almost surely, 2^27320777681 is an apocalyptic number.

It is an amenable number.

27320777681 is a deficient number, since it is larger than the sum of its proper divisors (1).

27320777681 is an equidigital number, since it uses as much as digits as its factorization.

27320777681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1382976, while the sum is 50.

The spelling of 27320777681 in words is "twenty-seven billion, three hundred twenty million, seven hundred seventy-seven thousand, six hundred eighty-one".