645053121056 has 48 divisors (see below), whose sum is σ = 1328918016384. Its totient is φ = 307629594624.

The previous prime is 645053121043. The next prime is 645053121061. The reversal of 645053121056 is 650121350546.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 981596 + ... + 1501211.

It is an arithmetic number, because the mean of its divisors is an integer number (27685792008).

Almost surely, 2^645053121056 is an apocalyptic number.

It is an amenable number.

645053121056 is an abundant number, since it is smaller than the sum of its proper divisors (683864895328).

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

645053121056 is a wasteful number, since it uses less digits than its factorization.

645053121056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483193 (or 2483185 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 645053121056 in words is "six hundred forty-five billion, fifty-three million, one hundred twenty-one thousand, fifty-six".