66116125221 has 8 divisors (see below), whose sum is σ = 88611595200. Its totient is φ = 43849036032.

The previous prime is 66116125199. The next prime is 66116125247. The reversal of 66116125221 is 12252161166.

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

It is not a de Polignac number, because 66116125221 - 2⁶ = 66116125157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66116125421) 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, 57094521 + ... + 57095678.

It is an arithmetic number, because the mean of its divisors is an integer number (11076449400).

Almost surely, 2^66116125221 is an apocalyptic number.

It is an amenable number.

66116125221 is a deficient number, since it is larger than the sum of its proper divisors (22495469979).

66116125221 is a wasteful number, since it uses less digits than its factorization.

66116125221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114190395.

The product of its digits is 8640, while the sum is 33.

Adding to 66116125221 its reverse (12252161166), we get a palindrome (78368286387).

The spelling of 66116125221 in words is "sixty-six billion, one hundred sixteen million, one hundred twenty-five thousand, two hundred twenty-one".