66001211 has 4 divisors (see below), whose sum is σ = 66284712. Its totient is φ = 65717712.

The previous prime is 66001183. The next prime is 66001213. The reversal of 66001211 is 11210066.

It is a happy number.

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 66001211 - 2¹⁴ = 65984827 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 66001211.

It is not an unprimeable number, because it can be changed into a prime (66001213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141401 + ... + 141866.

It is an arithmetic number, because the mean of its divisors is an integer number (16571178).

Almost surely, 2^66001211 is an apocalyptic number.

66001211 is a deficient number, since it is larger than the sum of its proper divisors (283501).

66001211 is a wasteful number, since it uses less digits than its factorization.

66001211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283500.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 66001211 is about 8124.1129361919. The cubic root of 66001211 is about 404.1264737348.

Adding to 66001211 its reverse (11210066), we get a palindrome (77211277).

The spelling of 66001211 in words is "sixty-six million, one thousand, two hundred eleven".