18188860865 has 16 divisors (see below), whose sum is σ = 24954068352. Its totient is φ = 12467689344.

The previous prime is 18188860861. The next prime is 18188860909. The reversal of 18188860865 is 56806888181.

It is a cyclic number.

It is not a de Polignac number, because 18188860865 - 2² = 18188860861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18188860861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1244 + ... + 190733.

It is an arithmetic number, because the mean of its divisors is an integer number (1559629272).

Almost surely, 2^18188860865 is an apocalyptic number.

It is an amenable number.

18188860865 is a deficient number, since it is larger than the sum of its proper divisors (6765207487).

18188860865 is a wasteful number, since it uses less digits than its factorization.

18188860865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194696.

The product of its (nonzero) digits is 5898240, while the sum is 59.

The spelling of 18188860865 in words is "eighteen billion, one hundred eighty-eight million, eight hundred sixty thousand, eight hundred sixty-five".