66708219 has 4 divisors (see below), whose sum is σ = 88944296. Its totient is φ = 44472144.

The previous prime is 66708199. The next prime is 66708227. The reversal of 66708219 is 91280766.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-66708219 is a prime.

It is a super-2 number, since 2×66708219² = 8899972964303922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66708419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11118034 + ... + 11118039.

It is an arithmetic number, because the mean of its divisors is an integer number (22236074).

Almost surely, 2^66708219 is an apocalyptic number.

66708219 is a deficient number, since it is larger than the sum of its proper divisors (22236077).

66708219 is a wasteful number, since it uses less digits than its factorization.

66708219 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22236076.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 66708219 is about 8167.5099632630. The cubic root of 66708219 is about 405.5643587700.

The spelling of 66708219 in words is "sixty-six million, seven hundred eight thousand, two hundred nineteen".