66245 has 4 divisors (see below), whose sum is σ = 79500. Its totient is φ = 52992.

The previous prime is 66239. The next prime is 66271. The reversal of 66245 is 54266.

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 20449 + 45796 = 143^2 + 214^2 .

It is a cyclic number.

It is not a de Polignac number, because 66245 - 2¹⁶ = 709 is a prime.

It is a d-powerful number, because it can be written as 6² + 6² + 2⁹ + 4⁸ + 5³ .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66245.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6620 + ... + 6629.

It is an arithmetic number, because the mean of its divisors is an integer number (19875).

2⁶⁶²⁴⁵ is an apocalyptic number.

It is an amenable number.

66245 is a deficient number, since it is larger than the sum of its proper divisors (13255).

66245 is a wasteful number, since it uses less digits than its factorization.

66245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13254.

The product of its digits is 1440, while the sum is 23.

The square root of 66245 is about 257.3810404828. The cubic root of 66245 is about 40.4623437010.

It can be divided in two parts, 662 and 45, that added together give a palindrome (707).

The spelling of 66245 in words is "sixty-six thousand, two hundred forty-five".