643505115364 has 6 divisors (see below), whose sum is σ = 1126133951894. Its totient is φ = 321752557680.

The previous prime is 643505115329. The next prime is 643505115373. The reversal of 643505115364 is 463511505346.

643505115364 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 only one way, i.e., 465765300900 + 177739814464 = 682470^2 + 421592^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 643505115364.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80438139417 + ... + 80438139424.

Almost surely, 2^643505115364 is an apocalyptic number.

It is an amenable number.

643505115364 is a deficient number, since it is larger than the sum of its proper divisors (482628836530).

643505115364 is a wasteful number, since it uses less digits than its factorization.

643505115364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160876278845 (or 160876278843 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 643505115364 in words is "six hundred forty-three billion, five hundred five million, one hundred fifteen thousand, three hundred sixty-four".