66662211 has 32 divisors (see below), whose sum is σ = 115642368. Its totient is φ = 33121440.

The previous prime is 66662209. The next prime is 66662221. The reversal of 66662211 is 11226666.

It is not a de Polignac number, because 66662211 - 2¹ = 66662209 is a prime.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (66662221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 961 + ... + 11586.

It is an arithmetic number, because the mean of its divisors is an integer number (3613824).

Almost surely, 2^66662211 is an apocalyptic number.

66662211 is a deficient number, since it is larger than the sum of its proper divisors (48980157).

66662211 is a wasteful number, since it uses less digits than its factorization.

66662211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12591.

The product of its digits is 5184, while the sum is 30.

The square root of 66662211 is about 8164.6929519731. The cubic root of 66662211 is about 405.4710994154.

Adding to 66662211 its reverse (11226666), we get a palindrome (77888877).

The spelling of 66662211 in words is "sixty-six million, six hundred sixty-two thousand, two hundred eleven".