66685512 has 32 divisors (see below), whose sum is σ = 167345280. Its totient is φ = 22144320.

The previous prime is 66685511. The next prime is 66685513. The reversal of 66685512 is 21558666.

66685512 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (66685511) and next prime (66685513).

It is not an unprimeable number, because it can be changed into a prime (66685511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1378 + ... + 11630.

It is an arithmetic number, because the mean of its divisors is an integer number (5229540).

Almost surely, 2^66685512 is an apocalyptic number.

It is an amenable number.

66685512 is an abundant number, since it is smaller than the sum of its proper divisors (100659768).

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

66685512 is a wasteful number, since it uses less digits than its factorization.

66685512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10533 (or 10529 counting only the distinct ones).

The product of its digits is 86400, while the sum is 39.

The square root of 66685512 is about 8166.1197640005. The cubic root of 66685512 is about 405.5183364800.

The spelling of 66685512 in words is "sixty-six million, six hundred eighty-five thousand, five hundred twelve".