66944285 has 16 divisors (see below), whose sum is σ = 83651376. Its totient is φ = 51383808.

The previous prime is 66944279. The next prime is 66944299. The reversal of 66944285 is 58244966.

It can be written as a sum of positive squares in 8 ways, for example, as 9351364 + 57592921 = 3058^2 + 7589^2 .

It is a cyclic number.

It is not a de Polignac number, because 66944285 - 2⁸ = 66944029 is a prime.

It is a super-2 number, since 2×66944285² = 8963074588322450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11027 + ... + 15983.

It is an arithmetic number, because the mean of its divisors is an integer number (5228211).

Almost surely, 2^66944285 is an apocalyptic number.

It is an amenable number.

66944285 is a deficient number, since it is larger than the sum of its proper divisors (16707091).

66944285 is a wasteful number, since it uses less digits than its factorization.

66944285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5072.

The product of its digits is 414720, while the sum is 44.

The square root of 66944285 is about 8181.9487287565. The cubic root of 66944285 is about 406.0421971559.

The spelling of 66944285 in words is "sixty-six million, nine hundred forty-four thousand, two hundred eighty-five".