66838173 has 8 divisors (see below), whose sum is σ = 89195328. Its totient is φ = 44519904.

The previous prime is 66838153. The next prime is 66838231. The reversal of 66838173 is 37183866.

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

It is not a de Polignac number, because 66838173 - 2⁸ = 66837917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66838103) 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, 5440 + ... + 12777.

It is an arithmetic number, because the mean of its divisors is an integer number (11149416).

Almost surely, 2^66838173 is an apocalyptic number.

It is an amenable number.

66838173 is a deficient number, since it is larger than the sum of its proper divisors (22357155).

66838173 is a wasteful number, since it uses less digits than its factorization.

66838173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19443.

The product of its digits is 145152, while the sum is 42.

The square root of 66838173 is about 8175.4616383419. The cubic root of 66838173 is about 405.8275473438.

The spelling of 66838173 in words is "sixty-six million, eight hundred thirty-eight thousand, one hundred seventy-three".