642065707568 has 20 divisors (see below), whose sum is σ = 1244605378848. Its totient is φ = 320877222720.

The previous prime is 642065707559. The next prime is 642065707573. The reversal of 642065707568 is 865707560246.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9692903 + ... + 9758918.

Almost surely, 2^642065707568 is an apocalyptic number.

It is an amenable number.

642065707568 is a deficient number, since it is larger than the sum of its proper divisors (602539671280).

642065707568 is a wasteful number, since it uses less digits than its factorization.

642065707568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19453892 (or 19453886 counting only the distinct ones).

The product of its (nonzero) digits is 16934400, while the sum is 56.

The spelling of 642065707568 in words is "six hundred forty-two billion, sixty-five million, seven hundred seven thousand, five hundred sixty-eight".