66009996 has 72 divisors (see below), whose sum is σ = 183578304. Its totient is φ = 19872000.

The previous prime is 66009973. The next prime is 66010013. The reversal of 66009996 is 69990066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20496 + ... + 23496.

Almost surely, 2^66009996 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 66009996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91789152).

66009996 is an abundant number, since it is smaller than the sum of its proper divisors (117568308).

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

66009996 is a wasteful number, since it uses less digits than its factorization.

66009996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3071 (or 3066 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 66009996 is about 8124.6535926155. The cubic root of 66009996 is about 404.1444031713.

The spelling of 66009996 in words is "sixty-six million, nine thousand, nine hundred ninety-six".