66197 has 4 divisors (see below), whose sum is σ = 67500. Its totient is φ = 64896.

The previous prime is 66191. The next prime is 66221. The reversal of 66197 is 79166.

It is a happy number.

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 37636 + 28561 = 194^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 66197 - 2¹⁰ = 65173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66191) 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, 572 + ... + 677.

It is an arithmetic number, because the mean of its divisors is an integer number (16875).

2⁶⁶¹⁹⁷ is an apocalyptic number.

It is an amenable number.

66197 is a deficient number, since it is larger than the sum of its proper divisors (1303).

66197 is a wasteful number, since it uses less digits than its factorization.

66197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302.

The product of its digits is 2268, while the sum is 29.

The square root of 66197 is about 257.2877766238. The cubic root of 66197 is about 40.4525685644.

The spelling of 66197 in words is "sixty-six thousand, one hundred ninety-seven".