642805907017 has 8 divisors (see below), whose sum is σ = 676987880960. Its totient is φ = 608658941520.

The previous prime is 642805906997. The next prime is 642805907027. The reversal of 642805907017 is 710709508246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642805907017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642805907027) 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, 8714409 + ... + 8787862.

It is an arithmetic number, because the mean of its divisors is an integer number (84623485120).

Almost surely, 2^642805907017 is an apocalyptic number.

It is an amenable number.

642805907017 is a deficient number, since it is larger than the sum of its proper divisors (34181973943).

642805907017 is a wasteful number, since it uses less digits than its factorization.

642805907017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17504223.

The product of its (nonzero) digits is 846720, while the sum is 49.

The spelling of 642805907017 in words is "six hundred forty-two billion, eight hundred five million, nine hundred seven thousand, seventeen".