809558897004 has 240 divisors, whose sum is σ = 2523456773376. Its totient is φ = 223069334400.

The previous prime is 809558896987. The next prime is 809558897011. The reversal of 809558897004 is 400798855908.

It is a happy number.

809558897004 is a `hidden beast` number, since 8 + 0 + 9 + 558 + 8 + 9 + 70 + 0 + 4 = 666.

It is an unprimeable number.

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 in 79 ways as a sum of consecutive naturals, for example, 2973849 + ... + 3234639.

Almost surely, 2^809558897004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 809558897004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1261728386688).

809558897004 is an abundant number, since it is smaller than the sum of its proper divisors (1713897876372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

809558897004 is a wasteful number, since it uses less digits than its factorization.

809558897004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260898 (or 260887 counting only the distinct ones).

The product of its (nonzero) digits is 29030400, while the sum is 63.

The spelling of 809558897004 in words is "eight hundred nine billion, five hundred fifty-eight million, eight hundred ninety-seven thousand, four".