66869 has 4 divisors (see below), whose sum is σ = 72960. Its totient is φ = 60780.

The previous prime is 66863. The next prime is 66877. The reversal of 66869 is 96866.

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.

It is a cyclic number.

It is not a de Polignac number, because 66869 - 2⁴ = 66853 is a prime.

It is a super-2 number, since 2×66869² = 8942926322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66863) 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, 3029 + ... + 3050.

It is an arithmetic number, because the mean of its divisors is an integer number (18240).

2⁶⁶⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

66869 is a deficient number, since it is larger than the sum of its proper divisors (6091).

66869 is a wasteful number, since it uses less digits than its factorization.

66869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6090.

The product of its digits is 15552, while the sum is 35.

The square root of 66869 is about 258.5904097216. The cubic root of 66869 is about 40.5889929475.

It can be divided in two parts, 668 and 69, that added together give a palindrome (737).

The spelling of 66869 in words is "sixty-six thousand, eight hundred sixty-nine".