27738085181 has 2 divisors, whose sum is σ = 27738085182. Its totient is φ = 27738085180.

The previous prime is 27738085159. The next prime is 27738085201. The reversal of 27738085181 is 18158083772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26273492281 + 1464592900 = 162091^2 + 38270^2 .

It is a cyclic number.

It is not a de Polignac number, because 27738085181 - 2¹⁴ = 27738068797 is a prime.

It is a super-2 number, since 2×27738085181² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27738055181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13869042590 + 13869042591.

It is an arithmetic number, because the mean of its divisors is an integer number (13869042591).

Almost surely, 2^27738085181 is an apocalyptic number.

It is an amenable number.

27738085181 is a deficient number, since it is larger than the sum of its proper divisors (1).

27738085181 is an equidigital number, since it uses as much as digits as its factorization.

27738085181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 752640, while the sum is 50.

The spelling of 27738085181 in words is "twenty-seven billion, seven hundred thirty-eight million, eighty-five thousand, one hundred eighty-one".