18178144317 has 6 divisors (see below), whose sum is σ = 26257319582. Its totient is φ = 12118762872.

The previous prime is 18178144291. The next prime is 18178144331. The reversal of 18178144317 is 71344187181.

It can be written as a sum of positive squares in only one way, i.e., 18057715641 + 120428676 = 134379^2 + 10974^2 .

It is not a de Polignac number, because 18178144317 - 2¹⁰ = 18178143293 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 (18178144717) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1009896898 + ... + 1009896915.

Almost surely, 2^18178144317 is an apocalyptic number.

It is an amenable number.

18178144317 is a deficient number, since it is larger than the sum of its proper divisors (8079175265).

18178144317 is a wasteful number, since it uses less digits than its factorization.

18178144317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019793819 (or 2019793816 counting only the distinct ones).

The product of its digits is 150528, while the sum is 45.

The spelling of 18178144317 in words is "eighteen billion, one hundred seventy-eight million, one hundred forty-four thousand, three hundred seventeen".