18865499866 has 16 divisors (see below), whose sum is σ = 28471629600. Its totient is φ = 9375013648.

The previous prime is 18865499839. The next prime is 18865499897. The reversal of 18865499866 is 66899456881.

It is a junction number, because it is equal to n+sod(n) for n = 18865499795 and 18865499804.

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, 703920 + ... + 730228.

It is an arithmetic number, because the mean of its divisors is an integer number (1779476850).

Almost surely, 2^18865499866 is an apocalyptic number.

18865499866 is a deficient number, since it is larger than the sum of its proper divisors (9606129734).

18865499866 is a wasteful number, since it uses less digits than its factorization.

18865499866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28493.

The product of its digits is 179159040, while the sum is 70.

The spelling of 18865499866 in words is "eighteen billion, eight hundred sixty-five million, four hundred ninety-nine thousand, eight hundred sixty-six".