66666166667 has 8 divisors (see below), whose sum is σ = 68231015424. Its totient is φ = 65101975848.

The previous prime is 66666166649. The next prime is 66666166681. The reversal of 66666166667 is 76666166666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66666166667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66666166627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43598 + ... + 367740.

It is an arithmetic number, because the mean of its divisors is an integer number (8528876928).

Almost surely, 2^66666166667 is an apocalyptic number.

66666166667 is a deficient number, since it is larger than the sum of its proper divisors (1564848757).

66666166667 is a wasteful number, since it uses less digits than its factorization.

66666166667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 328969.

The product of its digits is 70543872, while the sum is 62.

Subtracting 66666166667 from its reverse (76666166666), we obtain a palindrome (9999999999).

The spelling of 66666166667 in words is "sixty-six billion, six hundred sixty-six million, one hundred sixty-six thousand, six hundred sixty-seven".