66866128 has 40 divisors (see below), whose sum is σ = 149865408. Its totient is φ = 28307712.

The previous prime is 66866123. The next prime is 66866131. The reversal of 66866128 is 82166866.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66866123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5700 + ... + 12892.

Almost surely, 2^66866128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66866128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74932704).

66866128 is an abundant number, since it is smaller than the sum of its proper divisors (82999280).

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

66866128 is a wasteful number, since it uses less digits than its factorization.

66866128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7291 (or 7285 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The square root of 66866128 is about 8177.1711489977. The cubic root of 66866128 is about 405.8841184482.

The spelling of 66866128 in words is "sixty-six million, eight hundred sixty-six thousand, one hundred twenty-eight".