645301605424 has 80 divisors (see below), whose sum is σ = 1460768219136. Its totient is φ = 270398304000.

The previous prime is 645301605409. The next prime is 645301605449. The reversal of 645301605424 is 424506103546.

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 15 ways as a sum of consecutive naturals, for example, 5154774 + ... + 5278474.

Almost surely, 2^645301605424 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 645301605424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (730384109568).

645301605424 is an abundant number, since it is smaller than the sum of its proper divisors (815466613712).

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

645301605424 is a wasteful number, since it uses less digits than its factorization.

645301605424 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124754 (or 124748 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 40.

The spelling of 645301605424 in words is "six hundred forty-five billion, three hundred one million, six hundred five thousand, four hundred twenty-four".