66681434111 has 8 divisors (see below), whose sum is σ = 67818415104. Its totient is φ = 65553967960.

The previous prime is 66681434107. The next prime is 66681434143. The reversal of 66681434111 is 11143418666.

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 66681434111 - 2² = 66681434107 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 (66681434711) 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, 2364575 + ... + 2392608.

It is an arithmetic number, because the mean of its divisors is an integer number (8477301888).

Almost surely, 2^66681434111 is an apocalyptic number.

66681434111 is a deficient number, since it is larger than the sum of its proper divisors (1136980993).

66681434111 is a wasteful number, since it uses less digits than its factorization.

66681434111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4757421.

The product of its digits is 82944, while the sum is 41.

The spelling of 66681434111 in words is "sixty-six billion, six hundred eighty-one million, four hundred thirty-four thousand, one hundred eleven".