10001665 has 16 divisors (see below), whose sum is σ = 12960000. Its totient is φ = 7387072.

The previous prime is 10001659. The next prime is 10001687. The reversal of 10001665 is 56610001.

It is a cyclic number.

It is not a de Polignac number, because 10001665 - 2²³ = 1613057 is a prime.

10001665 is a modest number, since divided by 1665 gives 10 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1836 + ... + 4834.

It is an arithmetic number, because the mean of its divisors is an integer number (810000).

Almost surely, 2^10001665 is an apocalyptic number.

It is an amenable number.

10001665 is a deficient number, since it is larger than the sum of its proper divisors (2958335).

10001665 is a wasteful number, since it uses less digits than its factorization.

10001665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3056.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 10001665 is about 3162.5409088263. The cubic root of 10001665 is about 215.4554254522.

Adding to 10001665 its reverse (56610001), we get a palindrome (66611666).

The spelling of 10001665 in words is "ten million, one thousand, six hundred sixty-five".