643061474488 has 8 divisors (see below), whose sum is σ = 1205740264680. Its totient is φ = 321530737240.

The previous prime is 643061474467. The next prime is 643061474501. The reversal of 643061474488 is 884474160346.

It is a tau number, because it is divible by the number of its divisors (8).

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, 40191342148 + ... + 40191342163.

It is an arithmetic number, because the mean of its divisors is an integer number (150717533085).

Almost surely, 2^643061474488 is an apocalyptic number.

It is an amenable number.

643061474488 is a deficient number, since it is larger than the sum of its proper divisors (562678790192).

643061474488 is a wasteful number, since it uses less digits than its factorization.

643061474488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80382684317 (or 80382684313 counting only the distinct ones).

The product of its (nonzero) digits is 12386304, while the sum is 55.

The spelling of 643061474488 in words is "six hundred forty-three billion, sixty-one million, four hundred seventy-four thousand, four hundred eighty-eight".