18081009885 has 16 divisors (see below), whose sum is σ = 28932808320. Its totient is φ = 9642141120.

The previous prime is 18081009853. The next prime is 18081009887. The reversal of 18081009885 is 58890018081.

It is not a de Polignac number, because 18081009885 - 2⁵ = 18081009853 is a prime.

It is a super-2 number, since 2×18081009885² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18081009887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85096 + ... + 208334.

It is an arithmetic number, because the mean of its divisors is an integer number (1808300520).

Almost surely, 2^18081009885 is an apocalyptic number.

18081009885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18081009885 is a deficient number, since it is larger than the sum of its proper divisors (10851798435).

18081009885 is a wasteful number, since it uses less digits than its factorization.

18081009885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133028.

The product of its (nonzero) digits is 184320, while the sum is 48.

The spelling of 18081009885 in words is "eighteen billion, eighty-one million, nine thousand, eight hundred eighty-five".