66873251 has 4 divisors (see below), whose sum is σ = 66893904. Its totient is φ = 66852600.

The previous prime is 66873241. The next prime is 66873253. The reversal of 66873251 is 15237866.

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

It is a cyclic number.

It is not a de Polignac number, because 66873251 - 2⁶ = 66873187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66873253) 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, 4295 + ... + 12336.

It is an arithmetic number, because the mean of its divisors is an integer number (16723476).

Almost surely, 2^66873251 is an apocalyptic number.

66873251 is a deficient number, since it is larger than the sum of its proper divisors (20653).

66873251 is a wasteful number, since it uses less digits than its factorization.

66873251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20652.

The product of its digits is 60480, while the sum is 38.

The square root of 66873251 is about 8177.6066792186. The cubic root of 66873251 is about 405.8985303785.

The spelling of 66873251 in words is "sixty-six million, eight hundred seventy-three thousand, two hundred fifty-one".