27401272861 has 2 divisors, whose sum is σ = 27401272862. Its totient is φ = 27401272860.

The previous prime is 27401272841. The next prime is 27401272901. The reversal of 27401272861 is 16827210472.

It is an a-pointer prime, because the next prime (27401272901) can be obtained adding 27401272861 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27372048025 + 29224836 = 165445^2 + 5406^2 .

It is a cyclic number.

It is not a de Polignac number, because 27401272861 - 2¹³ = 27401264669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27401272841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13700636430 + 13700636431.

It is an arithmetic number, because the mean of its divisors is an integer number (13700636431).

Almost surely, 2^27401272861 is an apocalyptic number.

It is an amenable number.

27401272861 is a deficient number, since it is larger than the sum of its proper divisors (1).

27401272861 is an equidigital number, since it uses as much as digits as its factorization.

27401272861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 40.

The spelling of 27401272861 in words is "twenty-seven billion, four hundred one million, two hundred seventy-two thousand, eight hundred sixty-one".