66550173 has 4 divisors (see below), whose sum is σ = 88733568. Its totient is φ = 44366780.

The previous prime is 66550163. The next prime is 66550193. The reversal of 66550173 is 37105566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66550173 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550163) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 11091693 + ... + 11091698.

It is an arithmetic number, because the mean of its divisors is an integer number (22183392).

Almost surely, 2^66550173 is an apocalyptic number.

It is an amenable number.

66550173 is a deficient number, since it is larger than the sum of its proper divisors (22183395).

66550173 is a wasteful number, since it uses less digits than its factorization.

66550173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22183394.

The product of its (nonzero) digits is 18900, while the sum is 33.

The square root of 66550173 is about 8157.8289391234. The cubic root of 66550173 is about 405.2438160002.

The spelling of 66550173 in words is "sixty-six million, five hundred fifty thousand, one hundred seventy-three".