16568225840 has 80 divisors (see below), whose sum is σ = 41191247520. Its totient is φ = 6175641600.

The previous prime is 16568225837. The next prime is 16568225867. The reversal of 16568225840 is 4852286561.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×16568225840² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77051 + ... + 197669.

It is an arithmetic number, because the mean of its divisors is an integer number (514890594).

Almost surely, 2^16568225840 is an apocalyptic number.

16568225840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16568225840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20595623760).

16568225840 is an abundant number, since it is smaller than the sum of its proper divisors (24623021680).

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

16568225840 is a wasteful number, since it uses less digits than its factorization.

16568225840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120750 (or 120744 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 47.

The spelling of 16568225840 in words is "sixteen billion, five hundred sixty-eight million, two hundred twenty-five thousand, eight hundred forty".