66099205 has 8 divisors (see below), whose sum is σ = 81463032. Its totient is φ = 51450048.

The previous prime is 66099203. The next prime is 66099211. The reversal of 66099205 is 50299066.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 7392961 + 58706244 = 2719^2 + 7662^2 .

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 66099205 - 2¹ = 66099203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66099203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 178462 + ... + 178831.

It is an arithmetic number, because the mean of its divisors is an integer number (10182879).

Almost surely, 2^66099205 is an apocalyptic number.

It is an amenable number.

66099205 is a deficient number, since it is larger than the sum of its proper divisors (15363827).

66099205 is a wasteful number, since it uses less digits than its factorization.

66099205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357335.

The product of its (nonzero) digits is 29160, while the sum is 37.

The square root of 66099205 is about 8130.1417576817. The cubic root of 66099205 is about 404.3263811093.

The spelling of 66099205 in words is "sixty-six million, ninety-nine thousand, two hundred five".