645575168 has 160 divisors (see below), whose sum is σ = 1555614720. Its totient is φ = 261918720.

The previous prime is 645575143. The next prime is 645575171. The reversal of 645575168 is 861575546.

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, 9092573 + ... + 9092643.

It is an arithmetic number, because the mean of its divisors is an integer number (9722592).

Almost surely, 2^645575168 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 645575168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777807360).

645575168 is an abundant number, since it is smaller than the sum of its proper divisors (910039552).

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

645575168 is an equidigital number, since it uses as much as digits as its factorization.

645575168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 182 counting only the distinct ones).

The product of its digits is 1008000, while the sum is 47.

The square root of 645575168 is about 25408.1712840574. The cubic root of 645575168 is about 864.2690063140.

The spelling of 645575168 in words is "six hundred forty-five million, five hundred seventy-five thousand, one hundred sixty-eight".