642919513517 has 8 divisors (see below), whose sum is σ = 643171155840. Its totient is φ = 642667928320.

The previous prime is 642919513447. The next prime is 642919513541. The reversal of 642919513517 is 715315919246.

It is a happy number.

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-642919513517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642919513417) 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, 48992717 + ... + 49005837.

It is an arithmetic number, because the mean of its divisors is an integer number (80396394480).

Almost surely, 2^642919513517 is an apocalyptic number.

It is an amenable number.

642919513517 is a deficient number, since it is larger than the sum of its proper divisors (251642323).

642919513517 is a wasteful number, since it uses less digits than its factorization.

642919513517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28563.

The product of its digits is 2041200, while the sum is 53.

The spelling of 642919513517 in words is "six hundred forty-two billion, nine hundred nineteen million, five hundred thirteen thousand, five hundred seventeen".