18881406181 has 8 divisors (see below), whose sum is σ = 20615622624. Its totient is φ = 17150143920.

The previous prime is 18881406179. The next prime is 18881406239. The reversal of 18881406181 is 18160418881.

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 18881406181 - 2¹ = 18881406179 is a prime.

It is a super-2 number, since 2×18881406181² (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 (18881406151) 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, 725166 + ... + 750751.

It is an arithmetic number, because the mean of its divisors is an integer number (2576952828).

Almost surely, 2^18881406181 is an apocalyptic number.

18881406181 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18881406181 is a deficient number, since it is larger than the sum of its proper divisors (1734216443).

18881406181 is a wasteful number, since it uses less digits than its factorization.

18881406181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477091.

The product of its (nonzero) digits is 98304, while the sum is 46.

The spelling of 18881406181 in words is "eighteen billion, eight hundred eighty-one million, four hundred six thousand, one hundred eighty-one".