645826321424080 has 160 divisors (see below), whose sum is σ = 1585483327929600. Its totient is φ = 243975098290176.

The previous prime is 645826321424021. The next prime is 645826321424101. The reversal of 645826321424080 is 80424123628546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 809011692 + ... + 809809588.

It is an arithmetic number, because the mean of its divisors is an integer number (9909270799560).

Almost surely, 2^{645826321424080} 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 645826321424080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792741663964800).

645826321424080 is an abundant number, since it is smaller than the sum of its proper divisors (939657006505520).

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

645826321424080 is a wasteful number, since it uses less digits than its factorization.

645826321424080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 799581 (or 799575 counting only the distinct ones).

The product of its (nonzero) digits is 17694720, while the sum is 55.

The spelling of 645826321424080 in words is "six hundred forty-five trillion, eight hundred twenty-six billion, three hundred twenty-one million, four hundred twenty-four thousand, eighty".