66206505 has 16 divisors (see below), whose sum is σ = 108794304. Its totient is φ = 34355520.

The previous prime is 66206479. The next prime is 66206509. The reversal of 66206505 is 50560266.

It is not a de Polignac number, because 66206505 - 2¹⁹ = 65682217 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66206509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59091 + ... + 60200.

It is an arithmetic number, because the mean of its divisors is an integer number (6799644).

Almost surely, 2^66206505 is an apocalyptic number.

It is an amenable number.

66206505 is a deficient number, since it is larger than the sum of its proper divisors (42587799).

66206505 is a wasteful number, since it uses less digits than its factorization.

66206505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119336.

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66206505 is about 8136.7379827545. The cubic root of 66206505 is about 404.5450462020.

The spelling of 66206505 in words is "sixty-six million, two hundred six thousand, five hundred five".