643255426325 has 12 divisors (see below), whose sum is σ = 798710287008. Its totient is φ = 513911722800.

The previous prime is 643255426321. The next prime is 643255426343. The reversal of 643255426325 is 523624552346.

It is not a de Polignac number, because 643255426325 - 2² = 643255426321 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 643255426325.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643255426321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17296511 + ... + 17333660.

It is an arithmetic number, because the mean of its divisors is an integer number (66559190584).

Almost surely, 2^643255426325 is an apocalyptic number.

It is an amenable number.

643255426325 is a deficient number, since it is larger than the sum of its proper divisors (155454860683).

643255426325 is a wasteful number, since it uses less digits than its factorization.

643255426325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34630924 (or 34630919 counting only the distinct ones).

The product of its digits is 5184000, while the sum is 47.

The spelling of 643255426325 in words is "six hundred forty-three billion, two hundred fifty-five million, four hundred twenty-six thousand, three hundred twenty-five".