66659197 has 8 divisors (see below), whose sum is σ = 75227040. Its totient is φ = 58509360.

The previous prime is 66659179. The next prime is 66659233. The reversal of 66659197 is 79195666.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66659197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66659197.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66659137) 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 7 ways as a sum of consecutive naturals, for example, 104163 + ... + 104800.

It is an arithmetic number, because the mean of its divisors is an integer number (9403380).

Almost surely, 2^66659197 is an apocalyptic number.

It is an amenable number.

66659197 is a deficient number, since it is larger than the sum of its proper divisors (8567843).

66659197 is a wasteful number, since it uses less digits than its factorization.

66659197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209003.

The product of its digits is 612360, while the sum is 49.

The square root of 66659197 is about 8164.5083746665. The cubic root of 66659197 is about 405.4649884654.

The spelling of 66659197 in words is "sixty-six million, six hundred fifty-nine thousand, one hundred ninety-seven".