66111115656611 has 8 divisors (see below), whose sum is σ = 66138188455248. Its totient is φ = 66084043536000.

The previous prime is 66111115656497. The next prime is 66111115656647. The reversal of 66111115656611 is 11665651111166.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66111115656611 is a prime.

It is a super-2 number, since 2×66111115656611² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66111115656011) 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, 308995391 + ... + 309209271.

It is an arithmetic number, because the mean of its divisors is an integer number (8267273556906).

Almost surely, 2^{66111115656611} is an apocalyptic number.

66111115656611 is a deficient number, since it is larger than the sum of its proper divisors (27072798637).

66111115656611 is a wasteful number, since it uses less digits than its factorization.

66111115656611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339013.

The product of its digits is 194400, while the sum is 47.

Adding to 66111115656611 its reverse (11665651111166), we get a palindrome (77776766767777).

The spelling of 66111115656611 in words is "sixty-six trillion, one hundred eleven billion, one hundred fifteen million, six hundred fifty-six thousand, six hundred eleven".