66650211 has 12 divisors (see below), whose sum is σ = 96865288. Its totient is φ = 44159904.

The previous prime is 66650197. The next prime is 66650219. The reversal of 66650211 is 11205666.

It is a happy number.

It is not a de Polignac number, because 66650211 - 2⁶ = 66650147 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66650219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21250 + ... + 24183.

Almost surely, 2^66650211 is an apocalyptic number.

66650211 is a deficient number, since it is larger than the sum of its proper divisors (30215077).

66650211 is a wasteful number, since it uses less digits than its factorization.

66650211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45602 (or 45599 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 66650211 is about 8163.9580474179. The cubic root of 66650211 is about 405.4467680633.

Adding to 66650211 its reverse (11205666), we get a palindrome (77855877).

The spelling of 66650211 in words is "sixty-six million, six hundred fifty thousand, two hundred eleven".