10643665 has 4 divisors (see below), whose sum is σ = 12772404. Its totient is φ = 8514928.

The previous prime is 10643657. The next prime is 10643693. The reversal of 10643665 is 56634601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2486929 + 8156736 = 1577^2 + 2856^2 .

It is a cyclic number.

It is not a de Polignac number, because 10643665 - 2³ = 10643657 is a prime.

It is a super-2 number, since 2×10643665² = 226575209264450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 1064362 + ... + 1064371.

It is an arithmetic number, because the mean of its divisors is an integer number (3193101).

Almost surely, 2^10643665 is an apocalyptic number.

It is an amenable number.

10643665 is a deficient number, since it is larger than the sum of its proper divisors (2128739).

10643665 is an equidigital number, since it uses as much as digits as its factorization.

10643665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2128738.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 10643665 is about 3262.4630266104. The cubic root of 10643665 is about 219.9701405756.

The spelling of 10643665 in words is "ten million, six hundred forty-three thousand, six hundred sixty-five".