80509780021 has 16 divisors (see below), whose sum is σ = 94973886720. Its totient is φ = 67419719680.

The previous prime is 80509779923. The next prime is 80509780067. The reversal of 80509780021 is 12008790508.

It is a cyclic number.

It is not a de Polignac number, because 80509780021 - 2⁷ = 80509779893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80509787021) 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 in 15 ways as a sum of consecutive naturals, for example, 4571356 + ... + 4588933.

It is an arithmetic number, because the mean of its divisors is an integer number (5935867920).

Almost surely, 2^80509780021 is an apocalyptic number.

It is an amenable number.

80509780021 is a deficient number, since it is larger than the sum of its proper divisors (14464106699).

80509780021 is a wasteful number, since it uses less digits than its factorization.

80509780021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9160364.

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 80509780021 in words is "eighty billion, five hundred nine million, seven hundred eighty thousand, twenty-one".