80729443897 has 2 divisors, whose sum is σ = 80729443898. Its totient is φ = 80729443896.

The previous prime is 80729443859. The next prime is 80729443901. The reversal of 80729443897 is 79834492708.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77964366841 + 2765077056 = 279221^2 + 52584^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80729443897 is a prime.

It is a super-2 number, since 2×80729443897² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (80729443097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40364721948 + 40364721949.

It is an arithmetic number, because the mean of its divisors is an integer number (40364721949).

Almost surely, 2^80729443897 is an apocalyptic number.

It is an amenable number.

80729443897 is a deficient number, since it is larger than the sum of its proper divisors (1).

80729443897 is an equidigital number, since it uses as much as digits as its factorization.

80729443897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24385536, while the sum is 61.

The spelling of 80729443897 in words is "eighty billion, seven hundred twenty-nine million, four hundred forty-three thousand, eight hundred ninety-seven".