181858898858181 has 16 divisors (see below), whose sum is σ = 242529471273024. Its totient is φ = 121213797663104.

The previous prime is 181858898858173. The next prime is 181858898858227.

181858898858181 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 181858898858181 - 2³ = 181858898858173 is a prime.

It is a super-2 number, since 2×181858898858181² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181858898858101) 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, 543235210 + ... + 543569876.

It is an arithmetic number, because the mean of its divisors is an integer number (15158091954564).

Almost surely, 2^{181858898858181} is an apocalyptic number.

181858898858181 is the 8528984-th centered pentagonal number.

It is an amenable number.

181858898858181 is a deficient number, since it is larger than the sum of its proper divisors (60670572414843).

181858898858181 is a wasteful number, since it uses less digits than its factorization.

181858898858181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372180.

The product of its digits is 3774873600, while the sum is 87.

The spelling of 181858898858181 in words is "one hundred eighty-one trillion, eight hundred fifty-eight billion, eight hundred ninety-eight million, eight hundred fifty-eight thousand, one hundred eighty-one".