66864189173 has 4 divisors (see below), whose sum is σ = 66868023360. Its totient is φ = 66860354988.

The previous prime is 66864189151. The next prime is 66864189239. The reversal of 66864189173 is 37198146866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66864189173 - 2¹² = 66864185077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66864189373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1890815 + ... + 1925852.

It is an arithmetic number, because the mean of its divisors is an integer number (16717005840).

Almost surely, 2^66864189173 is an apocalyptic number.

It is an amenable number.

66864189173 is a deficient number, since it is larger than the sum of its proper divisors (3834187).

66864189173 is a wasteful number, since it uses less digits than its factorization.

66864189173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3834186.

The product of its digits is 10450944, while the sum is 59.

The spelling of 66864189173 in words is "sixty-six billion, eight hundred sixty-four million, one hundred eighty-nine thousand, one hundred seventy-three".