18666862145 has 4 divisors (see below), whose sum is σ = 22400234580. Its totient is φ = 14933489712.

The previous prime is 18666862141. The next prime is 18666862157. The reversal of 18666862145 is 54126866681.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6607088656 + 12059773489 = 81284^2 + 109817^2 .

It is a cyclic number.

It is not a de Polignac number, because 18666862145 - 2² = 18666862141 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18666862141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1866686210 + ... + 1866686219.

It is an arithmetic number, because the mean of its divisors is an integer number (5600058645).

Almost surely, 2^18666862145 is an apocalyptic number.

It is an amenable number.

18666862145 is a deficient number, since it is larger than the sum of its proper divisors (3733372435).

18666862145 is an equidigital number, since it uses as much as digits as its factorization.

18666862145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3733372434.

The product of its digits is 3317760, while the sum is 53.

The spelling of 18666862145 in words is "eighteen billion, six hundred sixty-six million, eight hundred sixty-two thousand, one hundred forty-five".