181220830290 has 48 divisors (see below), whose sum is σ = 472437447768. Its totient is φ = 48195986688.

The previous prime is 181220830253. The next prime is 181220830333. The reversal of 181220830290 is 92038022181.

It can be written as a sum of positive squares in 4 ways, for example, as 174467442249 + 6753388041 = 417693^2 + 82179^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2665579 + ... + 2732718.

Almost surely, 2^181220830290 is an apocalyptic number.

181220830290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181220830290 is an abundant number, since it is smaller than the sum of its proper divisors (291216617478).

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

181220830290 is a wasteful number, since it uses less digits than its factorization.

181220830290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5398683 (or 5398680 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 181220830290 in words is "one hundred eighty-one billion, two hundred twenty million, eight hundred thirty thousand, two hundred ninety".