643352425 has 24 divisors (see below), whose sum is σ = 825054336. Its totient is φ = 497365440.

The previous prime is 643352419. The next prime is 643352429. The reversal of 643352425 is 524253346.

643352425 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 643352425 - 2³ = 643352417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (643352429) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85152 + ... + 92398.

It is an arithmetic number, because the mean of its divisors is an integer number (34377264).

Almost surely, 2^643352425 is an apocalyptic number.

It is an amenable number.

643352425 is a deficient number, since it is larger than the sum of its proper divisors (181701911).

643352425 is a wasteful number, since it uses less digits than its factorization.

643352425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7377 (or 7372 counting only the distinct ones).

The product of its digits is 86400, while the sum is 34.

The square root of 643352425 is about 25364.3928569166. The cubic root of 643352425 is about 863.2759606516.

The spelling of 643352425 in words is "six hundred forty-three million, three hundred fifty-two thousand, four hundred twenty-five".