643523152 has 10 divisors (see below), whose sum is σ = 1246826138. Its totient is φ = 321761568.

The previous prime is 643523149. The next prime is 643523171. The reversal of 643523152 is 251325346.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 340623936 + 302899216 = 18456^2 + 17404^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20110083 + ... + 20110114.

Almost surely, 2^643523152 is an apocalyptic number.

It is an amenable number.

643523152 is a deficient number, since it is larger than the sum of its proper divisors (603302986).

643523152 is a wasteful number, since it uses less digits than its factorization.

643523152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40220205 (or 40220199 counting only the distinct ones).

The product of its digits is 21600, while the sum is 31.

The square root of 643523152 is about 25367.7581193136. The cubic root of 643523152 is about 863.3523166652.

Adding to 643523152 its reverse (251325346), we get a palindrome (894848498).

The spelling of 643523152 in words is "six hundred forty-three million, five hundred twenty-three thousand, one hundred fifty-two".