66686946 has 16 divisors (see below), whose sum is σ = 133454208. Its totient is φ = 22215600.

The previous prime is 66686927. The next prime is 66686947. The reversal of 66686946 is 64968666.

It is not an unprimeable number, because it can be changed into a prime (66686947) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 16551 + ... + 20181.

It is an arithmetic number, because the mean of its divisors is an integer number (8340888).

Almost surely, 2^66686946 is an apocalyptic number.

66686946 is an abundant number, since it is smaller than the sum of its proper divisors (66767262).

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

66686946 is a wasteful number, since it uses less digits than its factorization.

66686946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6697.

The product of its digits is 2239488, while the sum is 51.

The square root of 66686946 is about 8166.2075653268. The cubic root of 66686946 is about 405.5212432040.

The spelling of 66686946 in words is "sixty-six million, six hundred eighty-six thousand, nine hundred forty-six".