18011011111001 has 8 divisors (see below), whose sum is σ = 18264778625664. Its totient is φ = 17757246132640.

The previous prime is 18011011110979. The next prime is 18011011111031. The reversal of 18011011111001 is 10011111011081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18011011111001 - 2¹⁴ = 18011011094617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18011011111031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17162525 + ... + 18181701.

It is an arithmetic number, because the mean of its divisors is an integer number (2283097328208).

Almost surely, 2^{18011011111001} is an apocalyptic number.

It is an amenable number.

18011011111001 is a deficient number, since it is larger than the sum of its proper divisors (253767514663).

18011011111001 is a wasteful number, since it uses less digits than its factorization.

18011011111001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268151.

The product of its (nonzero) digits is 8, while the sum is 17.

Adding to 18011011111001 its reverse (10011111011081), we get a palindrome (28022122122082).

The spelling of 18011011111001 in words is "eighteen trillion, eleven billion, eleven million, one hundred eleven thousand, one".