66360221 has 8 divisors (see below), whose sum is σ = 70222464. Its totient is φ = 62579440.

The previous prime is 66360157. The next prime is 66360241. The reversal of 66360221 is 12206366.

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

It is a cyclic number.

It is not a de Polignac number, because 66360221 - 2⁶ = 66360157 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 (66360241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18686 + ... + 21951.

It is an arithmetic number, because the mean of its divisors is an integer number (8777808).

Almost surely, 2^66360221 is an apocalyptic number.

It is an amenable number.

66360221 is a deficient number, since it is larger than the sum of its proper divisors (3862243).

66360221 is a wasteful number, since it uses less digits than its factorization.

66360221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40731.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 66360221 is about 8146.1783064207. The cubic root of 66360221 is about 404.8578904960.

Adding to 66360221 its reverse (12206366), we get a palindrome (78566587).

The spelling of 66360221 in words is "sixty-six million, three hundred sixty thousand, two hundred twenty-one".