18609810871 has 4 divisors (see below), whose sum is σ = 18960939432. Its totient is φ = 18258682312.

The previous prime is 18609810859. The next prime is 18609810917. The reversal of 18609810871 is 17801890681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17801890681 = 23 ⋅773995247.

It is a cyclic number.

It is not a de Polignac number, because 18609810871 - 2²³ = 18601422263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18609810811) 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, 175564201 + ... + 175564306.

It is an arithmetic number, because the mean of its divisors is an integer number (4740234858).

Almost surely, 2^18609810871 is an apocalyptic number.

18609810871 is a deficient number, since it is larger than the sum of its proper divisors (351128561).

18609810871 is an equidigital number, since it uses as much as digits as its factorization.

18609810871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351128560.

The product of its (nonzero) digits is 193536, while the sum is 49.

The spelling of 18609810871 in words is "eighteen billion, six hundred nine million, eight hundred ten thousand, eight hundred seventy-one".