801665 has 8 divisors (see below), whose sum is σ = 1003968. Its totient is φ = 613360.

The previous prime is 801641. The next prime is 801677. The reversal of 801665 is 566108.

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

It is not a de Polignac number, because 801665 - 2¹² = 797569 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 801665.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3371 + ... + 3600.

It is an arithmetic number, because the mean of its divisors is an integer number (125496).

2⁸⁰¹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

801665 is a deficient number, since it is larger than the sum of its proper divisors (202303).

801665 is a wasteful number, since it uses less digits than its factorization.

801665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6999.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 801665 is about 895.3574705111. The cubic root of 801665 is about 92.8961340900.

The spelling of 801665 in words is "eight hundred one thousand, six hundred sixty-five".