66206605 has 8 divisors (see below), whose sum is σ = 79568352. Its totient is φ = 52885008.

The previous prime is 66206603. The next prime is 66206617. The reversal of 66206605 is 50660266.

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 66206605 - 2¹ = 66206603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66206603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6279 + ... + 13108.

It is an arithmetic number, because the mean of its divisors is an integer number (9946044).

Almost surely, 2^66206605 is an apocalyptic number.

It is an amenable number.

66206605 is a deficient number, since it is larger than the sum of its proper divisors (13361747).

66206605 is a wasteful number, since it uses less digits than its factorization.

66206605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20075.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 66206605 is about 8136.7441277209. The cubic root of 66206605 is about 404.5452498803.

It can be divided in two parts, 6620 and 6605, that added together give a square (13225 = 115²).

The spelling of 66206605 in words is "sixty-six million, two hundred six thousand, six hundred five".