66111111199 has 6 divisors (see below), whose sum is σ = 76904762064. Its totient is φ = 56666666700.

The previous prime is 66111111179. The next prime is 66111111203. The reversal of 66111111199 is 99111111166.

It is not a de Polignac number, because 66111111199 - 2¹⁹ = 66110586911 is a prime.

66111111199 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66111111149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 674603127 + ... + 674603224.

It is an arithmetic number, because the mean of its divisors is an integer number (12817460344).

Almost surely, 2^66111111199 is an apocalyptic number.

66111111199 is a deficient number, since it is larger than the sum of its proper divisors (10793650865).

66111111199 is a wasteful number, since it uses less digits than its factorization.

66111111199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1349206365 (or 1349206358 counting only the distinct ones).

The product of its digits is 2916, while the sum is 37.

It can be divided in two parts, 66111 and 111199, that added together give a triangular number (177310 = T₅₉₅).

The spelling of 66111111199 in words is "sixty-six billion, one hundred eleven million, one hundred eleven thousand, one hundred ninety-nine".