10661 has 4 divisors (see below), whose sum is σ = 12192. Its totient is φ = 9132.

The previous prime is 10657. The next prime is 10663. The reversal of 10661 is 16601.

10661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16601 = 13 ⋅1277.

It is a cyclic number.

It is not a de Polignac number, because 10661 - 2² = 10657 is a prime.

It is a super-2 number, since 2×10661² = 227313842, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 755 + ... + 768.

It is an arithmetic number, because the mean of its divisors is an integer number (3048).

2¹⁰⁶⁶¹ is an apocalyptic number.

It is an amenable number.

10661 is a deficient number, since it is larger than the sum of its proper divisors (1531).

10661 is an equidigital number, since it uses as much as digits as its factorization.

10661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 10661 is about 103.2521186223. The cubic root of 10661 is about 22.0089495269.

The spelling of 10661 in words is "ten thousand, six hundred sixty-one".