27144562681 has 2 divisors, whose sum is σ = 27144562682. Its totient is φ = 27144562680.

The previous prime is 27144562637. The next prime is 27144562703. The reversal of 27144562681 is 18626544172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13661869456 + 13482693225 = 116884^2 + 116115^2 .

It is a cyclic number.

It is not a de Polignac number, because 27144562681 - 2¹⁵ = 27144529913 is a prime.

It is a super-2 number, since 2×27144562681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27144562631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13572281340 + 13572281341.

It is an arithmetic number, because the mean of its divisors is an integer number (13572281341).

Almost surely, 2^27144562681 is an apocalyptic number.

It is an amenable number.

27144562681 is a deficient number, since it is larger than the sum of its proper divisors (1).

27144562681 is an equidigital number, since it uses as much as digits as its factorization.

27144562681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 645120, while the sum is 46.

The spelling of 27144562681 in words is "twenty-seven billion, one hundred forty-four million, five hundred sixty-two thousand, six hundred eighty-one".