66606210167 has 4 divisors (see below), whose sum is σ = 76121383056. Its totient is φ = 57091037280.

The previous prime is 66606210157. The next prime is 66606210169. The reversal of 66606210167 is 76101260666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76101260666 = 2 ⋅38050630333.

It is a cyclic number.

It is not a de Polignac number, because 66606210167 - 2¹⁰ = 66606209143 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 (66606210169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4757586434 + ... + 4757586447.

It is an arithmetic number, because the mean of its divisors is an integer number (19030345764).

Almost surely, 2^66606210167 is an apocalyptic number.

66606210167 is a deficient number, since it is larger than the sum of its proper divisors (9515172889).

66606210167 is an equidigital number, since it uses as much as digits as its factorization.

66606210167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9515172888.

The product of its (nonzero) digits is 108864, while the sum is 41.

The spelling of 66606210167 in words is "sixty-six billion, six hundred six million, two hundred ten thousand, one hundred sixty-seven".