66166611666167 has 4 divisors (see below), whose sum is σ = 66166628505360. Its totient is φ = 66166594826976.

The previous prime is 66166611666151. The next prime is 66166611666187. The reversal of 66166611666167 is 76166611666166.

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 66166611666167 - 2⁴ = 66166611666151 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 (66166611666107) 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, 949934 + ... + 11542772.

It is an arithmetic number, because the mean of its divisors is an integer number (16541657126340).

Almost surely, 2^{66166611666167} is an apocalyptic number.

66166611666167 is a deficient number, since it is larger than the sum of its proper divisors (16839193).

66166611666167 is a wasteful number, since it uses less digits than its factorization.

66166611666167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16839192.

The product of its digits is 70543872, while the sum is 65.

Subtracting 66166611666167 from its reverse (76166611666166), we obtain a palindrome (9999999999999).

It can be divided in two parts, 6616661 and 1666167, that added together give a palindrome (8282828).

The spelling of 66166611666167 in words is "sixty-six trillion, one hundred sixty-six billion, six hundred eleven million, six hundred sixty-six thousand, one hundred sixty-seven".