809880949989 has 24 divisors (see below), whose sum is σ = 1181008497240. Its totient is φ = 534767127552.

The previous prime is 809880949963. The next prime is 809880950027. The reversal of 809880949989 is 989949088908.

It can be written as a sum of positive squares in 4 ways, for example, as 221668647489 + 588212302500 = 470817^2 + 766950^2 .

It is not a de Polignac number, because 809880949989 - 2⁸ = 809880949733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809880949939) 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 in 23 ways as a sum of consecutive naturals, for example, 1174657 + ... + 1731929.

It is an arithmetic number, because the mean of its divisors is an integer number (49208687385).

Almost surely, 2^809880949989 is an apocalyptic number.

It is an amenable number.

809880949989 is a deficient number, since it is larger than the sum of its proper divisors (371127547251).

809880949989 is a wasteful number, since it uses less digits than its factorization.

809880949989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558821 (or 558818 counting only the distinct ones).

The product of its (nonzero) digits is 967458816, while the sum is 81.

The spelling of 809880949989 in words is "eight hundred nine billion, eight hundred eighty million, nine hundred forty-nine thousand, nine hundred eighty-nine".