645114025608 has 64 divisors (see below), whose sum is σ = 1812360493440. Its totient is φ = 189866333184.

The previous prime is 645114025607. The next prime is 645114025639. The reversal of 645114025608 is 806520411546.

It is a self number, because there is not a number n which added to its sum of digits gives 645114025608.

It is not an unprimeable number, because it can be changed into a prime (645114025607) by changing a digit.

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, 44942241 + ... + 44956592.

It is an arithmetic number, because the mean of its divisors is an integer number (28318132710).

Almost surely, 2^645114025608 is an apocalyptic number.

It is an amenable number.

645114025608 is an abundant number, since it is smaller than the sum of its proper divisors (1167246467832).

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

645114025608 is a wasteful number, since it uses less digits than its factorization.

645114025608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89898878 (or 89898874 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 42.

The spelling of 645114025608 in words is "six hundred forty-five billion, one hundred fourteen million, twenty-five thousand, six hundred eight".