643203406522 has 8 divisors (see below), whose sum is σ = 966537257076. Its totient is φ = 321024320832.

The previous prime is 643203406471. The next prime is 643203406583. The reversal of 643203406522 is 225604302346.

643203406522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 642596227641 + 607178881 = 801621^2 + 24641^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288689823 + ... + 288692050.

Almost surely, 2^643203406522 is an apocalyptic number.

643203406522 is a deficient number, since it is larger than the sum of its proper divisors (323333850554).

643203406522 is a wasteful number, since it uses less digits than its factorization.

643203406522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577382432.

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

Adding to 643203406522 its reverse (225604302346), we get a palindrome (868807708868).

The spelling of 643203406522 in words is "six hundred forty-three billion, two hundred three million, four hundred six thousand, five hundred twenty-two".