642702816768 has 80 divisors (see below), whose sum is σ = 1767432877056. Its totient is φ = 207323473920.

The previous prime is 642702816761. The next prime is 642702816809. The reversal of 642702816768 is 867618207246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642702816761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6701196 + ... + 6796427.

Almost surely, 2^642702816768 is an apocalyptic number.

It is an amenable number.

642702816768 is an abundant number, since it is smaller than the sum of its proper divisors (1124730060288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642702816768 is a wasteful number, since it uses less digits than its factorization.

642702816768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13497675 (or 13497659 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 57.

The spelling of 642702816768 in words is "six hundred forty-two billion, seven hundred two million, eight hundred sixteen thousand, seven hundred sixty-eight".