80017908918781 has 2 divisors, whose sum is σ = 80017908918782. Its totient is φ = 80017908918780.

The previous prime is 80017908918769. The next prime is 80017908918841. The reversal of 80017908918781 is 18781980971008.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67675861653156 + 12342047265625 = 8226534^2 + 3513125^2 .

It is a cyclic number.

It is not a de Polignac number, because 80017908918781 - 2¹⁹ = 80017908394493 is a prime.

It is a super-2 number, since 2×80017908918781² (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 (80017908948781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40008954459390 + 40008954459391.

It is an arithmetic number, because the mean of its divisors is an integer number (40008954459391).

Almost surely, 2^{80017908918781} is an apocalyptic number.

It is an amenable number.

80017908918781 is a deficient number, since it is larger than the sum of its proper divisors (1).

80017908918781 is an equidigital number, since it uses as much as digits as its factorization.

80017908918781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16257024, while the sum is 67.

The spelling of 80017908918781 in words is "eighty trillion, seventeen billion, nine hundred eight million, nine hundred eighteen thousand, seven hundred eighty-one".