1665928842 has 8 divisors (see below), whose sum is σ = 3331857696. Its totient is φ = 555309612.

The previous prime is 1665928841. The next prime is 1665928879. The reversal of 1665928842 is 2488295661.

It is a happy number.

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

1665928842 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1665928841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 138827398 + ... + 138827409.

It is an arithmetic number, because the mean of its divisors is an integer number (416482212).

Almost surely, 2^1665928842 is an apocalyptic number.

1665928842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1665928842 is a wasteful number, since it uses less digits than its factorization.

1665928842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277654812.

The product of its digits is 1658880, while the sum is 51.

The square root of 1665928842 is about 40815.7915763005. The cubic root of 1665928842 is about 1185.4561180983.

The spelling of 1665928842 in words is "one billion, six hundred sixty-five million, nine hundred twenty-eight thousand, eight hundred forty-two".