809210982128 has 10 divisors (see below), whose sum is σ = 1567846277904. Its totient is φ = 404605491056.

The previous prime is 809210982121. The next prime is 809210982137. The reversal of 809210982128 is 821289012908.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809210982121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25287843176 + ... + 25287843207.

Almost surely, 2^809210982128 is an apocalyptic number.

It is an amenable number.

809210982128 is a deficient number, since it is larger than the sum of its proper divisors (758635295776).

809210982128 is a wasteful number, since it uses less digits than its factorization.

809210982128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50575686391 (or 50575686385 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 50.

The spelling of 809210982128 in words is "eight hundred nine billion, two hundred ten million, nine hundred eighty-two thousand, one hundred twenty-eight".