17989409081 has 32 divisors (see below), whose sum is σ = 21200855040. Its totient is φ = 14947073856.

The previous prime is 17989409069. The next prime is 17989409111. The reversal of 17989409081 is 18090498971.

It is a cyclic number.

It is not a de Polignac number, because 17989409081 - 2⁶ = 17989409017 is a prime.

It is a super-2 number, since 2×17989409081² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (17989409041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14708636 + ... + 14709858.

It is an arithmetic number, because the mean of its divisors is an integer number (662526720).

Almost surely, 2^17989409081 is an apocalyptic number.

It is an amenable number.

17989409081 is a deficient number, since it is larger than the sum of its proper divisors (3211445959).

17989409081 is a wasteful number, since it uses less digits than its factorization.

17989409081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1773.

The product of its (nonzero) digits is 1306368, while the sum is 56.

The spelling of 17989409081 in words is "seventeen billion, nine hundred eighty-nine million, four hundred nine thousand, eighty-one".