66216204167 has 4 divisors (see below), whose sum is σ = 66220874616. Its totient is φ = 66211533720.

The previous prime is 66216204151. The next prime is 66216204181. The reversal of 66216204167 is 76140261266.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66216204167 - 2⁴ = 66216204151 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 (66216203167) 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, 2313893 + ... + 2342334.

It is an arithmetic number, because the mean of its divisors is an integer number (16555218654).

Almost surely, 2^66216204167 is an apocalyptic number.

66216204167 is a deficient number, since it is larger than the sum of its proper divisors (4670449).

66216204167 is a wasteful number, since it uses less digits than its factorization.

66216204167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4670448.

The product of its (nonzero) digits is 145152, while the sum is 41.

The spelling of 66216204167 in words is "sixty-six billion, two hundred sixteen million, two hundred four thousand, one hundred sixty-seven".