18840145009 has 4 divisors (see below), whose sum is σ = 21531594304. Its totient is φ = 16148695716.

The previous prime is 18840145007. The next prime is 18840145061. The reversal of 18840145009 is 90054104881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18840145009 - 2¹ = 18840145007 is a prime.

It is a super-2 number, since 2×18840145009² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18840145007) 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, 1345724637 + ... + 1345724650.

It is an arithmetic number, because the mean of its divisors is an integer number (5382898576).

Almost surely, 2^18840145009 is an apocalyptic number.

It is an amenable number.

18840145009 is a deficient number, since it is larger than the sum of its proper divisors (2691449295).

18840145009 is an equidigital number, since it uses as much as digits as its factorization.

18840145009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2691449294.

The product of its (nonzero) digits is 46080, while the sum is 40.

The spelling of 18840145009 in words is "eighteen billion, eight hundred forty million, one hundred forty-five thousand, nine".