1665728373 has 8 divisors (see below), whose sum is σ = 2252252736. Its totient is φ = 1094844800.

The previous prime is 1665728371. The next prime is 1665728377. The reversal of 1665728373 is 3738275661.

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

It is a cyclic number.

It is not a de Polignac number, because 1665728373 - 2¹ = 1665728371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665728371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3909948 + ... + 3910373.

It is an arithmetic number, because the mean of its divisors is an integer number (281531592).

Almost surely, 2^1665728373 is an apocalyptic number.

It is an amenable number.

1665728373 is a deficient number, since it is larger than the sum of its proper divisors (586524363).

1665728373 is an equidigital number, since it uses as much as digits as its factorization.

1665728373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7820395.

The product of its digits is 1270080, while the sum is 48.

The square root of 1665728373 is about 40813.3357249809. The cubic root of 1665728373 is about 1185.4085657000.

The spelling of 1665728373 in words is "one billion, six hundred sixty-five million, seven hundred twenty-eight thousand, three hundred seventy-three".