27643227869 has 2 divisors, whose sum is σ = 27643227870. Its totient is φ = 27643227868.

The previous prime is 27643227863. The next prime is 27643227919. The reversal of 27643227869 is 96872234672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16902600100 + 10740627769 = 130010^2 + 103637^2 .

It is a cyclic number.

It is not a de Polignac number, because 27643227869 - 2⁴ = 27643227853 is a prime.

It is a super-2 number, since 2×27643227869² (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 (27643227863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13821613934 + 13821613935.

It is an arithmetic number, because the mean of its divisors is an integer number (13821613935).

Almost surely, 2^27643227869 is an apocalyptic number.

It is an amenable number.

27643227869 is a deficient number, since it is larger than the sum of its proper divisors (1).

27643227869 is an equidigital number, since it uses as much as digits as its factorization.

27643227869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 56.

The spelling of 27643227869 in words is "twenty-seven billion, six hundred forty-three million, two hundred twenty-seven thousand, eight hundred sixty-nine".