643071565012 has 6 divisors (see below), whose sum is σ = 1125375238778. Its totient is φ = 321535782504.

The previous prime is 643071564991. The next prime is 643071565027. The reversal of 643071565012 is 210565170346.

643071565012 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., 577593920016 + 65477644996 = 759996^2 + 255886^2 .

It is a super-3 number, since 3×643071565012³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80383945623 + ... + 80383945630.

Almost surely, 2^643071565012 is an apocalyptic number.

It is an amenable number.

643071565012 is a deficient number, since it is larger than the sum of its proper divisors (482303673766).

643071565012 is a wasteful number, since it uses less digits than its factorization.

643071565012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160767891257 (or 160767891255 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 40.

The spelling of 643071565012 in words is "six hundred forty-three billion, seventy-one million, five hundred sixty-five thousand, twelve".