18171368181 has 12 divisors (see below), whose sum is σ = 27628981120. Its totient is φ = 11476653480.

The previous prime is 18171368107. The next prime is 18171368191. The reversal of 18171368181 is 18186317181.

It is a happy number.

It is not a de Polignac number, because 18171368181 - 2¹³ = 18171359989 is a prime.

It is a super-2 number, since 2×18171368181² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18171368101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53132485 + ... + 53132826.

Almost surely, 2^18171368181 is an apocalyptic number.

It is an amenable number.

18171368181 is a deficient number, since it is larger than the sum of its proper divisors (9457612939).

18171368181 is a wasteful number, since it uses less digits than its factorization.

18171368181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106265336 (or 106265333 counting only the distinct ones).

The product of its digits is 64512, while the sum is 45.

The spelling of 18171368181 in words is "eighteen billion, one hundred seventy-one million, three hundred sixty-eight thousand, one hundred eighty-one".