80821715184181 has 2 divisors, whose sum is σ = 80821715184182. Its totient is φ = 80821715184180.

The previous prime is 80821715184157. The next prime is 80821715184281. The reversal of 80821715184181 is 18148151712808.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41861223500625 + 38960491683556 = 6470025^2 + 6241834^2 .

It is a cyclic number.

It is not a de Polignac number, because 80821715184181 - 2⁵ = 80821715184149 is a prime.

It is a super-2 number, since 2×80821715184181² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80821715184121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40410857592090 + 40410857592091.

It is an arithmetic number, because the mean of its divisors is an integer number (40410857592091).

Almost surely, 2^{80821715184181} is an apocalyptic number.

It is an amenable number.

80821715184181 is a deficient number, since it is larger than the sum of its proper divisors (1).

80821715184181 is an equidigital number, since it uses as much as digits as its factorization.

80821715184181 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1146880, while the sum is 55.

Adding to 80821715184181 its reverse (18148151712808), we get a palindrome (98969866896989).

The spelling of 80821715184181 in words is "eighty trillion, eight hundred twenty-one billion, seven hundred fifteen million, one hundred eighty-four thousand, one hundred eighty-one".