18866381465217 has 48 divisors (see below), whose sum is σ = 29777957838720. Its totient is φ = 10554215358720.

The previous prime is 18866381465149. The next prime is 18866381465249. The reversal of 18866381465217 is 71256418366881.

It is not a de Polignac number, because 18866381465217 - 2²⁴ = 18866364688001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18866381465297) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 157927693 + ... + 158047109.

It is an arithmetic number, because the mean of its divisors is an integer number (620374121640).

Almost surely, 2^{18866381465217} is an apocalyptic number.

It is an amenable number.

18866381465217 is a deficient number, since it is larger than the sum of its proper divisors (10911576373503).

18866381465217 is a wasteful number, since it uses less digits than its factorization.

18866381465217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152934 (or 152923 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 66.

The spelling of 18866381465217 in words is "eighteen trillion, eight hundred sixty-six billion, three hundred eighty-one million, four hundred sixty-five thousand, two hundred seventeen".