2166616161667 has 4 divisors (see below), whose sum is σ = 2168713564600. Its totient is φ = 2164518758736.

The previous prime is 2166616161623. The next prime is 2166616161701. The reversal of 2166616161667 is 7661616166612.

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 2166616161667 - 2¹⁹ = 2166615637379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166616161067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1048699917 + ... + 1048701982.

It is an arithmetic number, because the mean of its divisors is an integer number (542178391150).

Almost surely, 2^{2166616161667} is an apocalyptic number.

2166616161667 is a deficient number, since it is larger than the sum of its proper divisors (2097402933).

2166616161667 is a wasteful number, since it uses less digits than its factorization.

2166616161667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2097402932.

The product of its digits is 3919104, while the sum is 55.

The spelling of 2166616161667 in words is "two trillion, one hundred sixty-six billion, six hundred sixteen million, one hundred sixty-one thousand, six hundred sixty-seven".