10011665 has 4 divisors (see below), whose sum is σ = 12014004. Its totient is φ = 8009328.

The previous prime is 10011643. The next prime is 10011679. The reversal of 10011665 is 56611001.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56611001 = 887 ⋅63823.

It can be written as a sum of positive squares in 2 ways, for example, as 4596736 + 5414929 = 2144^2 + 2327^2 .

It is a cyclic number.

It is not a de Polignac number, because 10011665 - 2¹⁸ = 9749521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001162 + ... + 1001171.

It is an arithmetic number, because the mean of its divisors is an integer number (3003501).

Almost surely, 2^10011665 is an apocalyptic number.

It is an amenable number.

10011665 is a deficient number, since it is larger than the sum of its proper divisors (2002339).

10011665 is an equidigital number, since it uses as much as digits as its factorization.

10011665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2002338.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 10011665 is about 3164.1215210545. The cubic root of 10011665 is about 215.5272080533.

Adding to 10011665 its reverse (56611001), we get a palindrome (66622666).

The spelling of 10011665 in words is "ten million, eleven thousand, six hundred sixty-five".