66219194 has 8 divisors (see below), whose sum is σ = 99363360. Its totient is φ = 33098076.

The previous prime is 66219191. The next prime is 66219217. The reversal of 66219194 is 49191266.

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

It is not an unprimeable number, because it can be changed into a prime (66219191) 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, 7937 + ... + 13979.

It is an arithmetic number, because the mean of its divisors is an integer number (12420420).

Almost surely, 2^66219194 is an apocalyptic number.

66219194 is a deficient number, since it is larger than the sum of its proper divisors (33144166).

66219194 is a wasteful number, since it uses less digits than its factorization.

66219194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11524.

The product of its digits is 23328, while the sum is 38.

The square root of 66219194 is about 8137.5176804723. The cubic root of 66219194 is about 404.5708893030.

The spelling of 66219194 in words is "sixty-six million, two hundred nineteen thousand, one hundred ninety-four".