66874217 has 4 divisors (see below), whose sum is σ = 66936276. Its totient is φ = 66812160.

The previous prime is 66874201. The next prime is 66874229. The reversal of 66874217 is 71247866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6330256 + 60543961 = 2516^2 + 7781^2 .

It is a cyclic number.

It is not a de Polignac number, because 66874217 - 2⁴ = 66874201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66874267) 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 3 ways as a sum of consecutive naturals, for example, 29384 + ... + 31577.

It is an arithmetic number, because the mean of its divisors is an integer number (16734069).

Almost surely, 2^66874217 is an apocalyptic number.

It is an amenable number.

66874217 is a deficient number, since it is larger than the sum of its proper divisors (62059).

66874217 is a wasteful number, since it uses less digits than its factorization.

66874217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62058.

The product of its digits is 112896, while the sum is 41.

The square root of 66874217 is about 8177.6657427410. The cubic root of 66874217 is about 405.9004848027.

The spelling of 66874217 in words is "sixty-six million, eight hundred seventy-four thousand, two hundred seventeen".