66973696 has 52 divisors (see below), whose sum is σ = 136232712. Its totient is φ = 32915456.

The previous prime is 66973679. The next prime is 66973703. The reversal of 66973696 is 69637966.

66973696 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 339870 + ... + 340066.

Almost surely, 2^66973696 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 66973696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68116356).

66973696 is an abundant number, since it is smaller than the sum of its proper divisors (69259016).

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

66973696 is an equidigital number, since it uses as much as digits as its factorization.

66973696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 282 counting only the distinct ones).

The product of its digits is 2204496, while the sum is 52.

The square root of 66973696 is about 8183.7458416058. The cubic root of 66973696 is about 406.1016513653.

The spelling of 66973696 in words is "sixty-six million, nine hundred seventy-three thousand, six hundred ninety-six".