27195814861 has 2 divisors, whose sum is σ = 27195814862. Its totient is φ = 27195814860.

The previous prime is 27195814829. The next prime is 27195814913. The reversal of 27195814861 is 16841859172.

It is an a-pointer prime, because the next prime (27195814913) can be obtained adding 27195814861 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18829053961 + 8366760900 = 137219^2 + 91470^2 .

It is a cyclic number.

It is not a de Polignac number, because 27195814861 - 2⁵ = 27195814829 is a prime.

It is a super-2 number, since 2×27195814861² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 27195814799 and 27195814808.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27195824861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13597907430 + 13597907431.

It is an arithmetic number, because the mean of its divisors is an integer number (13597907431).

Almost surely, 2^27195814861 is an apocalyptic number.

It is an amenable number.

27195814861 is a deficient number, since it is larger than the sum of its proper divisors (1).

27195814861 is an equidigital number, since it uses as much as digits as its factorization.

27195814861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 967680, while the sum is 52.

The spelling of 27195814861 in words is "twenty-seven billion, one hundred ninety-five million, eight hundred fourteen thousand, eight hundred sixty-one".