645322440024 has 240 divisors, whose sum is σ = 1886007998160. Its totient is φ = 206126985600.

The previous prime is 645322440013. The next prime is 645322440053. The reversal of 645322440024 is 420044223546.

645322440024 is a `hidden beast` number, since 6 + 4 + 5 + 3 + 224 + 400 + 24 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 64135954 + ... + 64146014.

It is an arithmetic number, because the mean of its divisors is an integer number (7858366659).

Almost surely, 2^645322440024 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 645322440024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (943003999080).

645322440024 is an abundant number, since it is smaller than the sum of its proper divisors (1240685558136).

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

645322440024 is a wasteful number, since it uses less digits than its factorization.

645322440024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10244 (or 10200 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 36.

The spelling of 645322440024 in words is "six hundred forty-five billion, three hundred twenty-two million, four hundred forty thousand, twenty-four".