181998036036 has 18 divisors (see below), whose sum is σ = 460050591182. Its totient is φ = 60666012000.

The previous prime is 181998036029. The next prime is 181998036107. The reversal of 181998036036 is 630630899181.

181998036036 is a `hidden beast` number, since 18 + 19 + 9 + 8 + 0 + 3 + 603 + 6 = 666.

181998036036 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 92716596036 + 89281440000 = 304494^2 + 298800^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×181998036036² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2527750465 + ... + 2527750536.

Almost surely, 2^181998036036 is an apocalyptic number.

It is an amenable number.

181998036036 is an abundant number, since it is smaller than the sum of its proper divisors (278052555146).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181998036036 is a wasteful number, since it uses less digits than its factorization.

181998036036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5055501011 (or 5055501006 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 181998036036 in words is "one hundred eighty-one billion, nine hundred ninety-eight million, thirty-six thousand, thirty-six".