80993767681 has 2 divisors, whose sum is σ = 80993767682. Its totient is φ = 80993767680.

The previous prime is 80993767669. The next prime is 80993767733. The reversal of 80993767681 is 18676739908.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72581209281 + 8412558400 = 269409^2 + 91720^2 .

It is a cyclic number.

It is not a de Polignac number, because 80993767681 - 2⁵ = 80993767649 is a prime.

It is a super-2 number, since 2×80993767681² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80993767651) 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, 40496883840 + 40496883841.

It is an arithmetic number, because the mean of its divisors is an integer number (40496883841).

Almost surely, 2^80993767681 is an apocalyptic number.

It is an amenable number.

80993767681 is a deficient number, since it is larger than the sum of its proper divisors (1).

80993767681 is an equidigital number, since it uses as much as digits as its factorization.

80993767681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27433728, while the sum is 64.

The spelling of 80993767681 in words is "eighty billion, nine hundred ninety-three million, seven hundred sixty-seven thousand, six hundred eighty-one".