645245563120 has 80 divisors (see below), whose sum is σ = 1590770728800. Its totient is φ = 242559967232.

The previous prime is 645245563099. The next prime is 645245563163. The reversal of 645245563120 is 21365542546.

645245563120 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

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, 581556 + ... + 1276204.

It is an arithmetic number, because the mean of its divisors is an integer number (19884634110).

Almost surely, 2^645245563120 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 645245563120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (795385364400).

645245563120 is an abundant number, since it is smaller than the sum of its proper divisors (945525165680).

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

645245563120 is a wasteful number, since it uses less digits than its factorization.

645245563120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695362 (or 695356 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 43.

The spelling of 645245563120 in words is "six hundred forty-five billion, two hundred forty-five million, five hundred sixty-three thousand, one hundred twenty".