180621022181 has 2 divisors, whose sum is σ = 180621022182. Its totient is φ = 180621022180.

The previous prime is 180621022159. The next prime is 180621022223. The reversal of 180621022181 is 181220126081.

180621022181 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179980426081 + 640596100 = 424241^2 + 25310^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-180621022181 is a prime.

It is a super-2 number, since 2×180621022181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (180621022081) 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 as a sum of consecutive naturals, namely, 90310511090 + 90310511091.

It is an arithmetic number, because the mean of its divisors is an integer number (90310511091).

Almost surely, 2^180621022181 is an apocalyptic number.

It is an amenable number.

180621022181 is a deficient number, since it is larger than the sum of its proper divisors (1).

180621022181 is an equidigital number, since it uses as much as digits as its factorization.

180621022181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 32.

The spelling of 180621022181 in words is "one hundred eighty billion, six hundred twenty-one million, twenty-two thousand, one hundred eighty-one".