66501205 has 8 divisors (see below), whose sum is σ = 82553400. Its totient is φ = 51366336.

The previous prime is 66501199. The next prime is 66501209. The reversal of 66501205 is 50210566.

It can be written as a sum of positive squares in 4 ways, for example, as 550564 + 65950641 = 742^2 + 8121^2 .

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 66501205 - 2⁷ = 66501077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66501205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66501209) 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, 229170 + ... + 229459.

It is an arithmetic number, because the mean of its divisors is an integer number (10319175).

Almost surely, 2^66501205 is an apocalyptic number.

It is an amenable number.

66501205 is a deficient number, since it is larger than the sum of its proper divisors (16052195).

66501205 is a wasteful number, since it uses less digits than its factorization.

66501205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458663.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 66501205 is about 8154.8270981058. The cubic root of 66501205 is about 405.1443980354.

The spelling of 66501205 in words is "sixty-six million, five hundred one thousand, two hundred five".