645142326625 has 64 divisors (see below), whose sum is σ = 920240455680. Its totient is φ = 448611609600.

The previous prime is 645142326613. The next prime is 645142326629. The reversal of 645142326625 is 526623241546.

It is not a de Polignac number, because 645142326625 - 2⁷ = 645142326497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (645142326629) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1189792 + ... + 1644958.

It is an arithmetic number, because the mean of its divisors is an integer number (14378757120).

Almost surely, 2^645142326625 is an apocalyptic number.

It is an amenable number.

645142326625 is a deficient number, since it is larger than the sum of its proper divisors (275098129055).

645142326625 is a wasteful number, since it uses less digits than its factorization.

645142326625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455251 (or 455241 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 46.

The spelling of 645142326625 in words is "six hundred forty-five billion, one hundred forty-two million, three hundred twenty-six thousand, six hundred twenty-five".