66520068 has 12 divisors (see below), whose sum is σ = 155213520. Its totient is φ = 22173352.

The previous prime is 66520063. The next prime is 66520151. The reversal of 66520068 is 86002566.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (66520061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2771658 + ... + 2771681.

It is an arithmetic number, because the mean of its divisors is an integer number (12934460).

Almost surely, 2^66520068 is an apocalyptic number.

It is an amenable number.

66520068 is an abundant number, since it is smaller than the sum of its proper divisors (88693452).

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

66520068 is a wasteful number, since it uses less digits than its factorization.

66520068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5543346 (or 5543344 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 66520068 is about 8155.9835703611. The cubic root of 66520068 is about 405.1827006813.

The spelling of 66520068 in words is "sixty-six million, five hundred twenty thousand, sixty-eight".