642706605165 has 8 divisors (see below), whose sum is σ = 1028330568288. Its totient is φ = 342776856080.

The previous prime is 642706605161. The next prime is 642706605179. The reversal of 642706605165 is 561506607246.

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

It is not a de Polignac number, because 642706605165 - 2² = 642706605161 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642706605161) 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, 21423553491 + ... + 21423553520.

It is an arithmetic number, because the mean of its divisors is an integer number (128541321036).

Almost surely, 2^642706605165 is an apocalyptic number.

It is an amenable number.

642706605165 is a deficient number, since it is larger than the sum of its proper divisors (385623963123).

642706605165 is a wasteful number, since it uses less digits than its factorization.

642706605165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42847107019.

The product of its (nonzero) digits is 1814400, while the sum is 48.

The spelling of 642706605165 in words is "six hundred forty-two billion, seven hundred six million, six hundred five thousand, one hundred sixty-five".