181809780030 has 24 divisors (see below), whose sum is σ = 472705428312. Its totient is φ = 48482607984.

The previous prime is 181809780001. The next prime is 181809780041. The reversal of 181809780030 is 30087908181.

181809780030 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×181809780030² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1010054244 + ... + 1010054423.

It is an arithmetic number, because the mean of its divisors is an integer number (19696059513).

Almost surely, 2^181809780030 is an apocalyptic number.

181809780030 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181809780030 is an abundant number, since it is smaller than the sum of its proper divisors (290895648282).

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

181809780030 is a wasteful number, since it uses less digits than its factorization.

181809780030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020108680 (or 2020108677 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The spelling of 181809780030 in words is "one hundred eighty-one billion, eight hundred nine million, seven hundred eighty thousand, thirty".