643523325344 has 12 divisors (see below), whose sum is σ = 1266936546834. Its totient is φ = 321761662656.

The previous prime is 643523325337. The next prime is 643523325421. The reversal of 643523325344 is 443523325346.

It can be written as a sum of positive squares in only one way, i.e., 477232272400 + 166291052944 = 690820^2 + 407788^2 .

It is a junction number, because it is equal to n+sod(n) for n = 643523325295 and 643523325304.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055051927 + ... + 10055051990.

Almost surely, 2^643523325344 is an apocalyptic number.

It is an amenable number.

643523325344 is a deficient number, since it is larger than the sum of its proper divisors (623413221490).

643523325344 is a wasteful number, since it uses less digits than its factorization.

643523325344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20110103927 (or 20110103919 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 44.

The spelling of 643523325344 in words is "six hundred forty-three billion, five hundred twenty-three million, three hundred twenty-five thousand, three hundred forty-four".