66427 has 4 divisors (see below), whose sum is σ = 66976. Its totient is φ = 65880.

The previous prime is 66413. The next prime is 66431. The reversal of 66427 is 72466.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66427 is a prime.

It is a Duffinian number.

66427 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (66457) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3 + ... + 364.

It is an arithmetic number, because the mean of its divisors is an integer number (16744).

2⁶⁶⁴²⁷ is an apocalyptic number.

66427 is a deficient number, since it is larger than the sum of its proper divisors (549).

66427 is a wasteful number, since it uses less digits than its factorization.

66427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548.

The product of its digits is 2016, while the sum is 25.

The square root of 66427 is about 257.7343593703. The cubic root of 66427 is about 40.4993649242.

It can be divided in two parts, 66 and 427, that multiplied together give a palindrome (28182).

The spelling of 66427 in words is "sixty-six thousand, four hundred twenty-seven".