27726515881 has 2 divisors, whose sum is σ = 27726515882. Its totient is φ = 27726515880.

The previous prime is 27726515819. The next prime is 27726515897. The reversal of 27726515881 is 18851562772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21967982656 + 5758533225 = 148216^2 + 75885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27726515881 is a prime.

It is a super-2 number, since 2×27726515881² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27726515281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13863257940 + 13863257941.

It is an arithmetic number, because the mean of its divisors is an integer number (13863257941).

Almost surely, 2^27726515881 is an apocalyptic number.

It is an amenable number.

27726515881 is a deficient number, since it is larger than the sum of its proper divisors (1).

27726515881 is an equidigital number, since it uses as much as digits as its factorization.

27726515881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1881600, while the sum is 52.

The spelling of 27726515881 in words is "twenty-seven billion, seven hundred twenty-six million, five hundred fifteen thousand, eight hundred eighty-one".