66408167 has 4 divisors (see below), whose sum is σ = 75895056. Its totient is φ = 56921280.

The previous prime is 66408163. The next prime is 66408187. The reversal of 66408167 is 76180466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76180466 = 2 ⋅38090233.

It is a cyclic number.

It is not a de Polignac number, because 66408167 - 2² = 66408163 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66408167.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66408161) 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, 4743434 + ... + 4743447.

It is an arithmetic number, because the mean of its divisors is an integer number (18973764).

Almost surely, 2^66408167 is an apocalyptic number.

66408167 is a deficient number, since it is larger than the sum of its proper divisors (9486889).

66408167 is an equidigital number, since it uses as much as digits as its factorization.

66408167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9486888.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 66408167 is about 8149.1206274051. The cubic root of 66408167 is about 404.9553718035.

The spelling of 66408167 in words is "sixty-six million, four hundred eight thousand, one hundred sixty-seven".