809941157568 has 168 divisors, whose sum is σ = 2476879994160. Its totient is φ = 252159098880.

The previous prime is 809941157561. The next prime is 809941157633. The reversal of 809941157568 is 865751149908.

809941157568 is a `hidden beast` number, since 8 + 0 + 9 + 9 + 4 + 11 + 57 + 568 = 666.

It is not an unprimeable number, because it can be changed into a prime (809941157561) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 967048 + ... + 1598456.

Almost surely, 2^809941157568 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 809941157568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238439997080).

809941157568 is an abundant number, since it is smaller than the sum of its proper divisors (1666938836592).

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

809941157568 is a wasteful number, since it uses less digits than its factorization.

809941157568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631575 (or 631562 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 63.

The spelling of 809941157568 in words is "eight hundred nine billion, nine hundred forty-one million, one hundred fifty-seven thousand, five hundred sixty-eight".