181673031636 has 36 divisors (see below), whose sum is σ = 459245427732. Its totient is φ = 60555517824.

The previous prime is 181673031629. The next prime is 181673031641. The reversal of 181673031636 is 636130376181.

181673031636 is a `hidden beast` number, since 1 + 8 + 1 + 6 + 7 + 3 + 0 + 3 + 1 + 636 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46329979536 + 135343052100 = 215244^2 + 367890^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 181673031591 and 181673031600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1178656 + ... + 1323848.

It is an arithmetic number, because the mean of its divisors is an integer number (12756817437).

Almost surely, 2^181673031636 is an apocalyptic number.

It is an amenable number.

181673031636 is an abundant number, since it is smaller than the sum of its proper divisors (277572396096).

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

181673031636 is a wasteful number, since it uses less digits than its factorization.

181673031636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179960 (or 179955 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The spelling of 181673031636 in words is "one hundred eighty-one billion, six hundred seventy-three million, thirty-one thousand, six hundred thirty-six".