643163035444556 has 48 divisors (see below), whose sum is σ = 1248026099217408. Its totient is φ = 287563616121600.

The previous prime is 643163035444541. The next prime is 643163035444603. The reversal of 643163035444556 is 655444530361346.

It is a junction number, because it is equal to n+sod(n) for n = 643163035444495 and 643163035444504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236381780 + ... + 239087163.

It is an arithmetic number, because the mean of its divisors is an integer number (26000543733696).

Almost surely, 2^{643163035444556} is an apocalyptic number.

It is an amenable number.

643163035444556 is a deficient number, since it is larger than the sum of its proper divisors (604863063772852).

643163035444556 is a wasteful number, since it uses less digits than its factorization.

643163035444556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 475469462 (or 475469460 counting only the distinct ones).

The product of its (nonzero) digits is 186624000, while the sum is 59.

The spelling of 643163035444556 in words is "six hundred forty-three trillion, one hundred sixty-three billion, thirty-five million, four hundred forty-four thousand, five hundred fifty-six".