66469 has 4 divisors (see below), whose sum is σ = 71596. Its totient is φ = 61344.

The previous prime is 66467. The next prime is 66491. The reversal of 66469 is 96466.

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 3969 + 62500 = 63^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 66469 - 2¹ = 66467 is a prime.

It is a super-2 number, since 2×66469² = 8836255922, which contains 22 as substring.

It is a Duffinian number.

66469 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 66469.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66463) 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, 2544 + ... + 2569.

It is an arithmetic number, because the mean of its divisors is an integer number (17899).

2⁶⁶⁴⁶⁹ is an apocalyptic number.

It is an amenable number.

66469 is a deficient number, since it is larger than the sum of its proper divisors (5127).

66469 is a wasteful number, since it uses less digits than its factorization.

66469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5126.

The product of its digits is 7776, while the sum is 31.

The square root of 66469 is about 257.8158257361. The cubic root of 66469 is about 40.5078986779.

It can be divided in two parts, 66 and 469, that added together give a palindrome (535).

The spelling of 66469 in words is "sixty-six thousand, four hundred sixty-nine".