66466218 has 128 divisors (see below), whose sum is σ = 177408000. Its totient is φ = 16111872.

The previous prime is 66466193. The next prime is 66466219. The reversal of 66466218 is 81266466.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (66466219) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 446008 + ... + 446156.

It is an arithmetic number, because the mean of its divisors is an integer number (1386000).

Almost surely, 2^66466218 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66466218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88704000).

66466218 is an abundant number, since it is smaller than the sum of its proper divisors (110941782).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66466218 is a wasteful number, since it uses less digits than its factorization.

66466218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236.

The product of its digits is 82944, while the sum is 39.

The square root of 66466218 is about 8152.6816447105. The cubic root of 66466218 is about 405.0733352949.

The spelling of 66466218 in words is "sixty-six million, four hundred sixty-six thousand, two hundred eighteen".