66208256 has 20 divisors (see below), whose sum is σ = 132288222. Its totient is φ = 33103872.

The previous prime is 66208253. The next prime is 66208267. The reversal of 66208256 is 65280266.

It can be written as a sum of positive squares in only one way, i.e., 52070656 + 14137600 = 7216^2 + 3760^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66208253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64145 + ... + 65168.

Almost surely, 2^66208256 is an apocalyptic number.

It is an amenable number.

66208256 is a deficient number, since it is larger than the sum of its proper divisors (66079966).

66208256 is an equidigital number, since it uses as much as digits as its factorization.

66208256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129331 (or 129315 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 66208256 is about 8136.8455804445. The cubic root of 66208256 is about 404.5486125794.

The spelling of 66208256 in words is "sixty-six million, two hundred eight thousand, two hundred fifty-six".