66742205 has 16 divisors (see below), whose sum is σ = 83804544. Its totient is φ = 50930880.

The previous prime is 66742199. The next prime is 66742237. The reversal of 66742205 is 50224766.

It is not a de Polignac number, because 66742205 - 2⁶ = 66742141 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62375 + ... + 63435.

It is an arithmetic number, because the mean of its divisors is an integer number (5237784).

Almost surely, 2^66742205 is an apocalyptic number.

It is an amenable number.

66742205 is a deficient number, since it is larger than the sum of its proper divisors (17062339).

66742205 is a wasteful number, since it uses less digits than its factorization.

66742205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1636.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 66742205 is about 8169.5902590032. The cubic root of 66742205 is about 405.6332216997.

The spelling of 66742205 in words is "sixty-six million, seven hundred forty-two thousand, two hundred five".