66511212 has 24 divisors (see below), whose sum is σ = 155635200. Its totient is φ = 22107216.

The previous prime is 66511183. The next prime is 66511219. The reversal of 66511212 is 21211566.

It is not an unprimeable number, because it can be changed into a prime (66511219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3412 + ... + 12027.

It is an arithmetic number, because the mean of its divisors is an integer number (6484800).

Almost surely, 2^66511212 is an apocalyptic number.

It is an amenable number.

66511212 is an abundant number, since it is smaller than the sum of its proper divisors (89123988).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66511212 is a wasteful number, since it uses less digits than its factorization.

66511212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15805 (or 15803 counting only the distinct ones).

The product of its digits is 720, while the sum is 24.

The square root of 66511212 is about 8155.4406380036. The cubic root of 66511212 is about 405.1647188534.

Adding to 66511212 its reverse (21211566), we get a palindrome (87722778).

The spelling of 66511212 in words is "sixty-six million, five hundred eleven thousand, two hundred twelve".