18516441866 has 16 divisors (see below), whose sum is σ = 29984325000. Its totient is φ = 8525150208.

The previous prime is 18516441859. The next prime is 18516441877. The reversal of 18516441866 is 66814461581.

It can be written as a sum of positive squares in 4 ways, for example, as 12968426641 + 5548015225 = 113879^2 + 74485^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 859991 + ... + 881258.

Almost surely, 2^18516441866 is an apocalyptic number.

18516441866 is a deficient number, since it is larger than the sum of its proper divisors (11467883134).

18516441866 is a wasteful number, since it uses less digits than its factorization.

18516441866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1741673.

The product of its digits is 1105920, while the sum is 50.

The spelling of 18516441866 in words is "eighteen billion, five hundred sixteen million, four hundred forty-one thousand, eight hundred sixty-six".