18917275327 has 4 divisors (see below), whose sum is σ = 18917563320. Its totient is φ = 18916987336.

The previous prime is 18917275309. The next prime is 18917275337. The reversal of 18917275327 is 72357271981.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 72357271981 = 23 ⋅3145968347.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18917275327 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 (18917275337) 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, 8049 + ... + 194677.

It is an arithmetic number, because the mean of its divisors is an integer number (4729390830).

Almost surely, 2^18917275327 is an apocalyptic number.

18917275327 is a deficient number, since it is larger than the sum of its proper divisors (287993).

18917275327 is a wasteful number, since it uses less digits than its factorization.

18917275327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287992.

The product of its digits is 1481760, while the sum is 52.

The spelling of 18917275327 in words is "eighteen billion, nine hundred seventeen million, two hundred seventy-five thousand, three hundred twenty-seven".