181980001836 has 96 divisors (see below), whose sum is σ = 484974221760. Its totient is φ = 58969036800.

The previous prime is 181980001823. The next prime is 181980001843. The reversal of 181980001836 is 638100089181.

It is a junction number, because it is equal to n+sod(n) for n = 181980001791 and 181980001800.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4699996 + ... + 4738556.

It is an arithmetic number, because the mean of its divisors is an integer number (5051814810).

Almost surely, 2^181980001836 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181980001836, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242487110880).

181980001836 is an abundant number, since it is smaller than the sum of its proper divisors (302994219924).

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

181980001836 is a wasteful number, since it uses less digits than its factorization.

181980001836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39792 (or 39784 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 45.

The spelling of 181980001836 in words is "one hundred eighty-one billion, nine hundred eighty million, one thousand, eight hundred thirty-six".