645459435216 has 160 divisors (see below), whose sum is σ = 1925685379200. Its totient is φ = 206748702720.

The previous prime is 645459435119. The next prime is 645459435239. The reversal of 645459435216 is 612534954546.

645459435216 is a `hidden beast` number, since 6 + 4 + 5 + 4 + 594 + 35 + 2 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2521320 + ... + 2765496.

It is an arithmetic number, because the mean of its divisors is an integer number (12035533620).

Almost surely, 2^645459435216 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 645459435216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (962842689600).

645459435216 is an abundant number, since it is smaller than the sum of its proper divisors (1280225943984).

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

645459435216 is a wasteful number, since it uses less digits than its factorization.

645459435216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244434 (or 244422 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 54.

The spelling of 645459435216 in words is "six hundred forty-five billion, four hundred fifty-nine million, four hundred thirty-five thousand, two hundred sixteen".