66227217 has 16 divisors (see below), whose sum is σ = 106229760. Its totient is φ = 35852112.

The previous prime is 66227173. The next prime is 66227219. The reversal of 66227217 is 71272266.

It is not a de Polignac number, because 66227217 - 2¹¹ = 66225169 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66227219) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82593 + ... + 83390.

It is an arithmetic number, because the mean of its divisors is an integer number (6639360).

Almost surely, 2^66227217 is an apocalyptic number.

It is an amenable number.

66227217 is a deficient number, since it is larger than the sum of its proper divisors (40002543).

66227217 is a wasteful number, since it uses less digits than its factorization.

66227217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166012.

The product of its digits is 14112, while the sum is 33.

The square root of 66227217 is about 8138.0106291403. The cubic root of 66227217 is about 404.5872276735.

The spelling of 66227217 in words is "sixty-six million, two hundred twenty-seven thousand, two hundred seventeen".