18080202181 has 16 divisors (see below), whose sum is σ = 19848826368. Its totient is φ = 16416259200.

The previous prime is 18080202169. The next prime is 18080202197. The reversal of 18080202181 is 18120208081.

It is a happy number.

It is not a de Polignac number, because 18080202181 - 2⁵ = 18080202149 is a prime.

It is a super-2 number, since 2×18080202181² (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 (18080202281) 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, 224205 + ... + 293986.

It is an arithmetic number, because the mean of its divisors is an integer number (1240551648).

Almost surely, 2^18080202181 is an apocalyptic number.

It is an amenable number.

18080202181 is a deficient number, since it is larger than the sum of its proper divisors (1768624187).

18080202181 is a wasteful number, since it uses less digits than its factorization.

18080202181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518292.

The product of its (nonzero) digits is 2048, while the sum is 31.

The spelling of 18080202181 in words is "eighteen billion, eighty million, two hundred two thousand, one hundred eighty-one".