645600655325 has 6 divisors (see below), whose sum is σ = 800544812634. Its totient is φ = 516480524240.

The previous prime is 645600655319. The next prime is 645600655387. The reversal of 645600655325 is 523556006546.

It can be written as a sum of positive squares in 3 ways, for example, as 25195530361 + 620405124964 = 158731^2 + 787658^2 .

It is not a de Polignac number, because 645600655325 - 2¹⁰ = 645600654301 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 645600655325.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12912013082 + ... + 12912013131.

It is an arithmetic number, because the mean of its divisors is an integer number (133424135439).

Almost surely, 2^645600655325 is an apocalyptic number.

It is an amenable number.

645600655325 is a deficient number, since it is larger than the sum of its proper divisors (154944157309).

645600655325 is a wasteful number, since it uses less digits than its factorization.

645600655325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25824026223 (or 25824026218 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 47.

The spelling of 645600655325 in words is "six hundred forty-five billion, six hundred million, six hundred fifty-five thousand, three hundred twenty-five".