18171618011 has 4 divisors (see below), whose sum is σ = 18238672224. Its totient is φ = 18104563800.

The previous prime is 18171617963. The next prime is 18171618029. The reversal of 18171618011 is 11081617181.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18171618011 - 2¹⁰ = 18171616987 is a prime.

It is a super-2 number, since 2×18171618011² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18171618911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33526700 + ... + 33527241.

It is an arithmetic number, because the mean of its divisors is an integer number (4559668056).

Almost surely, 2^18171618011 is an apocalyptic number.

18171618011 is a deficient number, since it is larger than the sum of its proper divisors (67054213).

18171618011 is an equidigital number, since it uses as much as digits as its factorization.

18171618011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67054212.

The product of its (nonzero) digits is 2688, while the sum is 35.

The spelling of 18171618011 in words is "eighteen billion, one hundred seventy-one million, six hundred eighteen thousand, eleven".