181908920616 has 32 divisors (see below), whose sum is σ = 455475234240. Its totient is φ = 60542582528.

The previous prime is 181908920593. The next prime is 181908920647. The reversal of 181908920616 is 616029809181.

181908920616 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5841921 + ... + 5872976.

It is an arithmetic number, because the mean of its divisors is an integer number (14233601070).

Almost surely, 2^181908920616 is an apocalyptic number.

It is an amenable number.

181908920616 is an abundant number, since it is smaller than the sum of its proper divisors (273566313624).

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

181908920616 is a wasteful number, since it uses less digits than its factorization.

181908920616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11715553 (or 11715549 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 51.

The spelling of 181908920616 in words is "one hundred eighty-one billion, nine hundred eight million, nine hundred twenty thousand, six hundred sixteen".