18445636827 has 12 divisors (see below), whose sum is σ = 26692953664. Its totient is φ = 12274357680.

The previous prime is 18445636813. The next prime is 18445636831. The reversal of 18445636827 is 72863654481.

It is a happy number.

18445636827 is a `hidden beast` number, since 1 + 84 + 456 + 36 + 82 + 7 = 666.

It is not a de Polignac number, because 18445636827 - 2¹⁴ = 18445620443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18445636127) 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 11 ways as a sum of consecutive naturals, for example, 1889323 + ... + 1899060.

Almost surely, 2^18445636827 is an apocalyptic number.

18445636827 is a deficient number, since it is larger than the sum of its proper divisors (8247316837).

18445636827 is a wasteful number, since it uses less digits than its factorization.

18445636827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3788930 (or 3788927 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 54.

The spelling of 18445636827 in words is "eighteen billion, four hundred forty-five million, six hundred thirty-six thousand, eight hundred twenty-seven".