66680173 has 8 divisors (see below), whose sum is σ = 76534848. Its totient is φ = 56907744.

The previous prime is 66680161. The next prime is 66680189. The reversal of 66680173 is 37108666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66680173 - 2¹³ = 66671981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66680113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18811 + ... + 22072.

It is an arithmetic number, because the mean of its divisors is an integer number (9566856).

Almost surely, 2^66680173 is an apocalyptic number.

It is an amenable number.

66680173 is a deficient number, since it is larger than the sum of its proper divisors (9854675).

66680173 is a wasteful number, since it uses less digits than its factorization.

66680173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41123.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 66680173 is about 8165.7928580145. The cubic root of 66680173 is about 405.5075139384.

The spelling of 66680173 in words is "sixty-six million, six hundred eighty thousand, one hundred seventy-three".