66013211 has 4 divisors (see below), whose sum is σ = 72014424. Its totient is φ = 60012000.

The previous prime is 66013187. The next prime is 66013219. The reversal of 66013211 is 11231066.

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 66013211 - 2¹⁸ = 65751067 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66013219) 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, 3000590 + ... + 3000611.

It is an arithmetic number, because the mean of its divisors is an integer number (18003606).

Almost surely, 2^66013211 is an apocalyptic number.

66013211 is a deficient number, since it is larger than the sum of its proper divisors (6001213).

66013211 is a wasteful number, since it uses less digits than its factorization.

66013211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6001212.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 66013211 is about 8124.8514447958. The cubic root of 66013211 is about 404.1509643148.

Adding to 66013211 its reverse (11231066), we get a palindrome (77244277).

The spelling of 66013211 in words is "sixty-six million, thirteen thousand, two hundred eleven".