10000665 has 24 divisors (see below), whose sum is σ = 17978688. Its totient is φ = 5333040.

The previous prime is 10000657. The next prime is 10000667. The reversal of 10000665 is 56600001.

10000665 is a `hidden beast` number, since 1 + 0 + 0 + 0 + 0 + 665 = 666.

10000665 is nontrivially palindromic in base 2.

It is not a de Polignac number, because 10000665 - 2³ = 10000657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10000667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2901 + ... + 5330.

It is an arithmetic number, because the mean of its divisors is an integer number (749112).

Almost surely, 2^10000665 is an apocalyptic number.

10000665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

10000665 is a deficient number, since it is larger than the sum of its proper divisors (7978023).

10000665 is an frugal number, since it uses more digits than its factorization.

10000665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8251 (or 8239 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 10000665 is about 3162.3828041526. The cubic root of 10000665 is about 215.4482445609.

Adding to 10000665 its reverse (56600001), we get a palindrome (66600666).

The spelling of 10000665 in words is "ten million, six hundred sixty-five", and thus it is an aban number.