642335661573 has 8 divisors (see below), whose sum is σ = 877336513536. Its totient is φ = 417779292000.

The previous prime is 642335661553. The next prime is 642335661601. The reversal of 642335661573 is 375166533246.

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

It is not a de Polignac number, because 642335661573 - 2⁹ = 642335661061 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642335661533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2611120453 + ... + 2611120698.

It is an arithmetic number, because the mean of its divisors is an integer number (109667064192).

Almost surely, 2^642335661573 is an apocalyptic number.

It is an amenable number.

642335661573 is a deficient number, since it is larger than the sum of its proper divisors (235000851963).

642335661573 is a wasteful number, since it uses less digits than its factorization.

642335661573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5222241195.

The product of its digits is 8164800, while the sum is 51.

The spelling of 642335661573 in words is "six hundred forty-two billion, three hundred thirty-five million, six hundred sixty-one thousand, five hundred seventy-three".