181820000077 has 2 divisors, whose sum is σ = 181820000078. Its totient is φ = 181820000076.

The previous prime is 181820000069. The next prime is 181820000081. The reversal of 181820000077 is 770000028181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 175846874281 + 5973125796 = 419341^2 + 77286^2 .

It is a cyclic number.

It is not a de Polignac number, because 181820000077 - 2³ = 181820000069 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 181819999997 and 181820000051.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (181820003077) by changing a digit.

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 as a sum of consecutive naturals, namely, 90910000038 + 90910000039.

It is an arithmetic number, because the mean of its divisors is an integer number (90910000039).

Almost surely, 2^181820000077 is an apocalyptic number.

It is an amenable number.

181820000077 is a deficient number, since it is larger than the sum of its proper divisors (1).

181820000077 is an equidigital number, since it uses as much as digits as its factorization.

181820000077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6272, while the sum is 34.

The spelling of 181820000077 in words is "one hundred eighty-one billion, eight hundred twenty million, seventy-seven", and thus it is an aban number.