18543542066 has 12 divisors (see below), whose sum is σ = 32356588878. Its totient is φ = 7947232272.

The previous prime is 18543542023. The next prime is 18543542077. The reversal of 18543542066 is 66024534581.

It can be written as a sum of positive squares in only one way, i.e., 16764811441 + 1778730625 = 129479^2 + 42175^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 94609811 + ... + 94610006.

Almost surely, 2^18543542066 is an apocalyptic number.

18543542066 is a deficient number, since it is larger than the sum of its proper divisors (13813046812).

18543542066 is a wasteful number, since it uses less digits than its factorization.

18543542066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189219833 (or 189219826 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 44.

The spelling of 18543542066 in words is "eighteen billion, five hundred forty-three million, five hundred forty-two thousand, sixty-six".