66691848 has 16 divisors (see below), whose sum is σ = 166729680. Its totient is φ = 22230608.

The previous prime is 66691847. The next prime is 66691853. The reversal of 66691848 is 84819666.

66691848 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 66691797 and 66691806.

It is not an unprimeable number, because it can be changed into a prime (66691841) 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 3 ways as a sum of consecutive naturals, for example, 1389390 + ... + 1389437.

It is an arithmetic number, because the mean of its divisors is an integer number (10420605).

Almost surely, 2^66691848 is an apocalyptic number.

It is an amenable number.

66691848 is an abundant number, since it is smaller than the sum of its proper divisors (100037832).

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

66691848 is a wasteful number, since it uses less digits than its factorization.

66691848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778836 (or 2778832 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 66691848 is about 8166.5076991331. The cubic root of 66691848 is about 405.5311792637.

The spelling of 66691848 in words is "sixty-six million, six hundred ninety-one thousand, eight hundred forty-eight".