66856448 has 20 divisors (see below), whose sum is σ = 133583340. Its totient is φ = 33427968.

The previous prime is 66856399. The next prime is 66856507. The reversal of 66856448 is 84465866.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 64778 + ... + 65801.

It is an arithmetic number, because the mean of its divisors is an integer number (6679167).

Almost surely, 2^66856448 is an apocalyptic number.

It is an amenable number.

66856448 is a deficient number, since it is larger than the sum of its proper divisors (66726892).

66856448 is an equidigital number, since it uses as much as digits as its factorization.

66856448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130597 (or 130581 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 47.

The square root of 66856448 is about 8176.5792358418. The cubic root of 66856448 is about 405.8645313120.

The spelling of 66856448 in words is "sixty-six million, eight hundred fifty-six thousand, four hundred forty-eight".