18909127873 has 4 divisors (see below), whose sum is σ = 18909439920. Its totient is φ = 18908815828.

The previous prime is 18909127859. The next prime is 18909127889. The reversal of 18909127873 is 37872190981.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37872190981 = 11833 ⋅3200557.

It is a cyclic number.

It is not a de Polignac number, because 18909127873 - 2²⁹ = 18372256961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18909127813) 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, 32563 + ... + 197176.

It is an arithmetic number, because the mean of its divisors is an integer number (4727359980).

Almost surely, 2^18909127873 is an apocalyptic number.

It is an amenable number.

18909127873 is a deficient number, since it is larger than the sum of its proper divisors (312047).

18909127873 is an equidigital number, since it uses as much as digits as its factorization.

18909127873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312046.

The product of its (nonzero) digits is 1524096, while the sum is 55.

The spelling of 18909127873 in words is "eighteen billion, nine hundred nine million, one hundred twenty-seven thousand, eight hundred seventy-three".