181869065844 has 24 divisors (see below), whose sum is σ = 425927069568. Its totient is φ = 60399319680.

The previous prime is 181869065839. The next prime is 181869065867. The reversal of 181869065844 is 448560968181.

It is a happy number.

It is a super-2 number, since 2×181869065844² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27959397 + ... + 27965900.

It is an arithmetic number, because the mean of its divisors is an integer number (17746961232).

Almost surely, 2^181869065844 is an apocalyptic number.

It is an amenable number.

181869065844 is an abundant number, since it is smaller than the sum of its proper divisors (244058003724).

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

181869065844 is a wasteful number, since it uses less digits than its factorization.

181869065844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55925575 (or 55925573 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 60.

The spelling of 181869065844 in words is "one hundred eighty-one billion, eight hundred sixty-nine million, sixty-five thousand, eight hundred forty-four".