645344535056 has 40 divisors (see below), whose sum is σ = 1346829594264. Its totient is φ = 297786424320.

The previous prime is 645344535047. The next prime is 645344535061. The reversal of 645344535056 is 650535443546.

It can be written as a sum of positive squares in 4 ways, for example, as 8763955456 + 636580579600 = 93616^2 + 797860^2 .

It is a junction number, because it is equal to n+sod(n) for n = 645344534995 and 645344535013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625460 + ... + 1296876.

Almost surely, 2^645344535056 is an apocalyptic number.

It is an amenable number.

645344535056 is an abundant number, since it is smaller than the sum of its proper divisors (701485059208).

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

645344535056 is a wasteful number, since it uses less digits than its factorization.

645344535056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676059 (or 676053 counting only the distinct ones).

The product of its (nonzero) digits is 12960000, while the sum is 50.

The spelling of 645344535056 in words is "six hundred forty-five billion, three hundred forty-four million, five hundred thirty-five thousand, fifty-six".