66206611 has 4 divisors (see below), whose sum is σ = 66862224. Its totient is φ = 65551000.

The previous prime is 66206603. The next prime is 66206617. The reversal of 66206611 is 11660266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66206611 - 2³ = 66206603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66206611.

It is not an unprimeable number, because it can be changed into a prime (66206617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327655 + ... + 327856.

It is an arithmetic number, because the mean of its divisors is an integer number (16715556).

Almost surely, 2^66206611 is an apocalyptic number.

66206611 is a deficient number, since it is larger than the sum of its proper divisors (655613).

66206611 is a wasteful number, since it uses less digits than its factorization.

66206611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655612.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 66206611 is about 8136.7444964187. The cubic root of 66206611 is about 404.5452621010.

Adding to 66206611 its reverse (11660266), we get a palindrome (77866877).

It can be divided in two parts, 6620 and 6611, that added together give a palindrome (13231).

The spelling of 66206611 in words is "sixty-six million, two hundred six thousand, six hundred eleven".