27643906863 has 12 divisors (see below), whose sum is σ = 39944972080. Its totient is φ = 18422401536.

The previous prime is 27643906819. The next prime is 27643906879. The reversal of 27643906863 is 36860934672.

It is not a de Polignac number, because 27643906863 - 2¹⁷ = 27643775791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27643906813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 546931 + ... + 595332.

Almost surely, 2^27643906863 is an apocalyptic number.

27643906863 is a deficient number, since it is larger than the sum of its proper divisors (12301065217).

27643906863 is a wasteful number, since it uses less digits than its factorization.

27643906863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1144958 (or 1144955 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 54.

The spelling of 27643906863 in words is "twenty-seven billion, six hundred forty-three million, nine hundred six thousand, eight hundred sixty-three".