643240341325 has 96 divisors (see below), whose sum is σ = 853674111360. Its totient is φ = 480046694400.

The previous prime is 643240341319. The next prime is 643240341343. The reversal of 643240341325 is 523143042346.

643240341325 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 643240341325 - 2¹¹ = 643240339277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 549307990 + ... + 549309160.

It is an arithmetic number, because the mean of its divisors is an integer number (8892438660).

Almost surely, 2^643240341325 is an apocalyptic number.

It is an amenable number.

643240341325 is a deficient number, since it is larger than the sum of its proper divisors (210433770035).

643240341325 is a wasteful number, since it uses less digits than its factorization.

643240341325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1487 (or 1482 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 37.

The spelling of 643240341325 in words is "six hundred forty-three billion, two hundred forty million, three hundred forty-one thousand, three hundred twenty-five".