66630912 has 72 divisors (see below), whose sum is σ = 179299680. Its totient is φ = 21964800.

The previous prime is 66630899. The next prime is 66630919. The reversal of 66630912 is 21903666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66630919) 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, 77139 + ... + 77997.

Almost surely, 2^66630912 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 66630912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89649840).

66630912 is an abundant number, since it is smaller than the sum of its proper divisors (112668768).

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

66630912 is a wasteful number, since it uses less digits than its factorization.

66630912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 965 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 66630912 is about 8162.7759983966. The cubic root of 66630912 is about 405.4076310403.

The spelling of 66630912 in words is "sixty-six million, six hundred thirty thousand, nine hundred twelve".