27997415866 has 12 divisors (see below), whose sum is σ = 48852633978. Its totient is φ = 11998892472.

The previous prime is 27997415863. The next prime is 27997415867. The reversal of 27997415866 is 66851479972.

It can be written as a sum of positive squares in only one way, i.e., 27464775625 + 532640241 = 165725^2 + 23079^2 .

It is a junction number, because it is equal to n+sod(n) for n = 27997415798 and 27997415807.

It is not an unprimeable number, because it can be changed into a prime (27997415863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142843861 + ... + 142844056.

Almost surely, 2^27997415866 is an apocalyptic number.

27997415866 is a deficient number, since it is larger than the sum of its proper divisors (20855218112).

27997415866 is a wasteful number, since it uses less digits than its factorization.

27997415866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285687933 (or 285687926 counting only the distinct ones).

The product of its digits is 45722880, while the sum is 64.

The spelling of 27997415866 in words is "twenty-seven billion, nine hundred ninety-seven million, four hundred fifteen thousand, eight hundred sixty-six".