80763357721 has 2 divisors, whose sum is σ = 80763357722. Its totient is φ = 80763357720.

The previous prime is 80763357709. The next prime is 80763357799. The reversal of 80763357721 is 12775336708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53273717721 + 27489640000 = 230811^2 + 165800^2 .

It is a cyclic number.

It is not a de Polignac number, because 80763357721 - 2²⁵ = 80729803289 is a prime.

It is not a weakly prime, because it can be changed into another prime (80763357421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40381678860 + 40381678861.

It is an arithmetic number, because the mean of its divisors is an integer number (40381678861).

Almost surely, 2^80763357721 is an apocalyptic number.

It is an amenable number.

80763357721 is a deficient number, since it is larger than the sum of its proper divisors (1).

80763357721 is an equidigital number, since it uses as much as digits as its factorization.

80763357721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1481760, while the sum is 49.

The spelling of 80763357721 in words is "eighty billion, seven hundred sixty-three million, three hundred fifty-seven thousand, seven hundred twenty-one".