66522 has 8 divisors (see below), whose sum is σ = 133056. Its totient is φ = 22172.

The previous prime is 66509. The next prime is 66523. The reversal of 66522 is 22566.

It is a sphenic number, since it is the product of 3 distinct primes.

66522 is an admirable number.

It is a plaindrome in base 9.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66523) by changing a digit.

66522 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5538 + ... + 5549.

It is an arithmetic number, because the mean of its divisors is an integer number (16632).

2⁶⁶⁵²² is an apocalyptic number.

66522 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66528).

66522 is a wasteful number, since it uses less digits than its factorization.

66522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11092.

The product of its digits is 720, while the sum is 21.

The square root of 66522 is about 257.9185918076. The cubic root of 66522 is about 40.5186623334.

Subtracting from 66522 its reverse (22566), we obtain a triangular number (43956 = T₂₉₆).

The spelling of 66522 in words is "sixty-six thousand, five hundred twenty-two".