66450 has 24 divisors (see below), whose sum is σ = 165168. Its totient is φ = 17680.

The previous prime is 66449. The next prime is 66457. The reversal of 66450 is 5466.

It is a hoax number, since the sum of its digits (21) coincides with the sum of the digits of its distinct prime factors.

It is a plaindrome in base 9.

It is a zygodrome in base 9.

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 11 ways as a sum of consecutive naturals, for example, 72 + ... + 371.

It is an arithmetic number, because the mean of its divisors is an integer number (6882).

2⁶⁶⁴⁵⁰ is an apocalyptic number.

66450 is an abundant number, since it is smaller than the sum of its proper divisors (98718).

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 (82584).

66450 is a wasteful number, since it uses less digits than its factorization.

66450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458 (or 453 counting only the distinct ones).

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

The square root of 66450 is about 257.7789750930. The cubic root of 66450 is about 40.5040386157.

The spelling of 66450 in words is "sixty-six thousand, four hundred fifty".