645583603712 has 96 divisors (see below), whose sum is σ = 1297865368800. Its totient is φ = 321043267584.

The previous prime is 645583603711. The next prime is 645583603739. The reversal of 645583603712 is 217306385546.

It is not an unprimeable number, because it can be changed into a prime (645583603711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 396793043 + ... + 396794669.

It is an arithmetic number, because the mean of its divisors is an integer number (13519430925).

Almost surely, 2^645583603712 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 645583603712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (648932684400).

645583603712 is an abundant number, since it is smaller than the sum of its proper divisors (652281765088).

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

645583603712 is a wasteful number, since it uses less digits than its factorization.

645583603712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2581 (or 2561 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 50.

The spelling of 645583603712 in words is "six hundred forty-five billion, five hundred eighty-three million, six hundred three thousand, seven hundred twelve".