80809907398991 has 2 divisors, whose sum is σ = 80809907398992. Its totient is φ = 80809907398990.

The previous prime is 80809907398937. The next prime is 80809907398993. The reversal of 80809907398991 is 19989370990808.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-80809907398991 is a prime.

It is a super-2 number, since 2×80809907398991² (a number of 29 digits) contains 22 as substring.

Together with 80809907398993, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80809907398993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40404953699495 + 40404953699496.

It is an arithmetic number, because the mean of its divisors is an integer number (40404953699496).

Almost surely, 2^{80809907398991} is an apocalyptic number.

80809907398991 is a deficient number, since it is larger than the sum of its proper divisors (1).

80809907398991 is an equidigital number, since it uses as much as digits as its factorization.

80809907398991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 634894848, while the sum is 80.

The spelling of 80809907398991 in words is "eighty trillion, eight hundred nine billion, nine hundred seven million, three hundred ninety-eight thousand, nine hundred ninety-one".