645896044248 has 384 divisors, whose sum is σ = 2043989606400. Its totient is φ = 165616109568.

The previous prime is 645896044247. The next prime is 645896044271. The reversal of 645896044248 is 842440698546.

It is a junction number, because it is equal to n+sod(n) for n = 645896044191 and 645896044200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645896044247) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 779126298 + ... + 779127126.

It is an arithmetic number, because the mean of its divisors is an integer number (5322889600).

Almost surely, 2^645896044248 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 645896044248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1021994803200).

645896044248 is an abundant number, since it is smaller than the sum of its proper divisors (1398093562152).

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

645896044248 is a wasteful number, since it uses less digits than its factorization.

645896044248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091 (or 1034 counting only the distinct ones).

The product of its (nonzero) digits is 53084160, while the sum is 60.

The spelling of 645896044248 in words is "six hundred forty-five billion, eight hundred ninety-six million, forty-four thousand, two hundred forty-eight".