66704281 has 16 divisors (see below), whose sum is σ = 79528960. Its totient is φ = 54743040.

The previous prime is 66704257. The next prime is 66704299. The reversal of 66704281 is 18240766.

It is a cyclic number.

It is not a de Polignac number, because 66704281 - 2⁵ = 66704249 is a prime.

It is a super-2 number, since 2×66704281² = 8898922207453922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66704201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19465 + ... + 22633.

It is an arithmetic number, because the mean of its divisors is an integer number (4970560).

Almost surely, 2^66704281 is an apocalyptic number.

It is an amenable number.

66704281 is a deficient number, since it is larger than the sum of its proper divisors (12824679).

66704281 is a wasteful number, since it uses less digits than its factorization.

66704281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3304.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 66704281 is about 8167.2688825580. The cubic root of 66704281 is about 405.5563780249.

The spelling of 66704281 in words is "sixty-six million, seven hundred four thousand, two hundred eighty-one".