181820357316 has 48 divisors (see below), whose sum is σ = 507646585600. Its totient is φ = 55944724896.

The previous prime is 181820357311. The next prime is 181820357333. The reversal of 181820357316 is 613753028181.

It is a happy number.

181820357316 is a `hidden beast` number, since 1 + 81 + 8 + 203 + 57 + 316 = 666.

181820357316 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (181820357311) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 64749436 + ... + 64752243.

Almost surely, 2^181820357316 is an apocalyptic number.

It is an amenable number.

181820357316 is an abundant number, since it is smaller than the sum of its proper divisors (325826228284).

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

181820357316 is a wasteful number, since it uses less digits than its factorization.

181820357316 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129501705 (or 129501697 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 181820357316 in words is "one hundred eighty-one billion, eight hundred twenty million, three hundred fifty-seven thousand, three hundred sixteen".