643352445 has 24 divisors (see below), whose sum is σ = 1173837600. Its totient is φ = 325061856.

The previous prime is 643352429. The next prime is 643352449. The reversal of 643352445 is 544253346.

643352445 is a `hidden beast` number, since 64 + 33 + 524 + 45 = 666.

It is not a de Polignac number, because 643352445 - 2⁴ = 643352429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643352449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 375375 + ... + 377084.

It is an arithmetic number, because the mean of its divisors is an integer number (48909900).

Almost surely, 2^643352445 is an apocalyptic number.

It is an amenable number.

643352445 is a deficient number, since it is larger than the sum of its proper divisors (530485155).

643352445 is a wasteful number, since it uses less digits than its factorization.

643352445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752489 (or 752486 counting only the distinct ones).

The product of its digits is 172800, while the sum is 36.

The square root of 643352445 is about 25364.3932511700. The cubic root of 643352445 is about 863.2759695972.

Subtracting from 643352445 its reverse (544253346), we obtain a palindrome (99099099).

The spelling of 643352445 in words is "six hundred forty-three million, three hundred fifty-two thousand, four hundred forty-five".