80281077781 has 2 divisors, whose sum is σ = 80281077782. Its totient is φ = 80281077780.

The previous prime is 80281077757. The next prime is 80281077791. The reversal of 80281077781 is 18777018208.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66066477156 + 14214600625 = 257034^2 + 119225^2 .

It is a cyclic number.

It is not a de Polignac number, because 80281077781 - 2¹¹ = 80281075733 is a prime.

It is a super-2 number, since 2×80281077781² (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 (80281077791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40140538890 + 40140538891.

It is an arithmetic number, because the mean of its divisors is an integer number (40140538891).

Almost surely, 2^80281077781 is an apocalyptic number.

It is an amenable number.

80281077781 is a deficient number, since it is larger than the sum of its proper divisors (1).

80281077781 is an equidigital number, since it uses as much as digits as its factorization.

80281077781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 351232, while the sum is 49.

The spelling of 80281077781 in words is "eighty billion, two hundred eighty-one million, seventy-seven thousand, seven hundred eighty-one".