642008863617 has 48 divisors (see below), whose sum is σ = 963741408000. Its totient is φ = 379747859040.

The previous prime is 642008863603. The next prime is 642008863687. The reversal of 642008863617 is 716368800246.

It is not a de Polignac number, because 642008863617 - 2⁸ = 642008863361 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642008863617.

It is not an unprimeable number, because it can be changed into a prime (642008863687) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2869134 + ... + 3084792.

It is an arithmetic number, because the mean of its divisors is an integer number (20077946000).

Almost surely, 2^642008863617 is an apocalyptic number.

It is an amenable number.

642008863617 is a deficient number, since it is larger than the sum of its proper divisors (321732544383).

642008863617 is a wasteful number, since it uses less digits than its factorization.

642008863617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215882 (or 215871 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 51.

The spelling of 642008863617 in words is "six hundred forty-two billion, eight million, eight hundred sixty-three thousand, six hundred seventeen".