56669 has 4 divisors (see below), whose sum is σ = 57660. Its totient is φ = 55680.

The previous prime is 56663. The next prime is 56671. The reversal of 56669 is 96665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96665 = 5 ⋅19333.

It can be written as a sum of positive squares in 2 ways, for example, as 1444 + 55225 = 38^2 + 235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56669 is a prime.

It is a super-2 number, since 2×56669² = 6422751122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10 and base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404 + ... + 525.

It is an arithmetic number, because the mean of its divisors is an integer number (14415).

2⁵⁶⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

56669 is a deficient number, since it is larger than the sum of its proper divisors (991).

56669 is an equidigital number, since it uses as much as digits as its factorization.

56669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 990.

The product of its digits is 9720, while the sum is 32.

The square root of 56669 is about 238.0525152146. The cubic root of 56669 is about 38.4103722704.

The spelling of 56669 in words is "fifty-six thousand, six hundred sixty-nine".