66683556 has 27 divisors (see below), whose sum is σ = 168685153. Its totient is φ = 22211520.

The previous prime is 66683549. The next prime is 66683567. The reversal of 66683556 is 65538666.

The square root of 66683556 is 8166.

It is a perfect power (a square), and thus also a powerful number.

66683556 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 11329956 + 55353600 = 3366^2 + 7440^2 .

It is a super-3 number, since 3×66683556³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian 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 8 ways as a sum of consecutive naturals, for example, 48316 + ... + 49676.

Almost surely, 2^66683556 is an apocalyptic number.

66683556 is the 8166-th square number.

It is an amenable number.

66683556 is an abundant number, since it is smaller than the sum of its proper divisors (102001597).

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

66683556 is a wasteful number, since it uses less digits than its factorization.

66683556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2732 (or 1366 counting only the distinct ones).

The product of its digits is 777600, while the sum is 45.

The cubic root of 66683556 is about 405.5143715927.

The spelling of 66683556 in words is "sixty-six million, six hundred eighty-three thousand, five hundred fifty-six".