27861440881 has 2 divisors, whose sum is σ = 27861440882. Its totient is φ = 27861440880.

The previous prime is 27861440869. The next prime is 27861440897. The reversal of 27861440881 is 18804416872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18714240000 + 9147200881 = 136800^2 + 95641^2 .

It is a cyclic number.

It is not a de Polignac number, because 27861440881 - 2³¹ = 25713957233 is a prime.

It is a super-2 number, since 2×27861440881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27861440851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13930720440 + 13930720441.

It is an arithmetic number, because the mean of its divisors is an integer number (13930720441).

Almost surely, 2^27861440881 is an apocalyptic number.

It is an amenable number.

27861440881 is a deficient number, since it is larger than the sum of its proper divisors (1).

27861440881 is an equidigital number, since it uses as much as digits as its factorization.

27861440881 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 688128, while the sum is 49.

The spelling of 27861440881 in words is "twenty-seven billion, eight hundred sixty-one million, four hundred forty thousand, eight hundred eighty-one".