66212712 has 24 divisors (see below), whose sum is σ = 179326290. Its totient is φ = 22070880.

The previous prime is 66212711. The next prime is 66212737. The reversal of 66212712 is 21721266.

66212712 is a `hidden beast` number, since 6 + 621 + 27 + 12 = 666.

It can be written as a sum of positive squares in only one way, i.e., 58890276 + 7322436 = 7674^2 + 2706^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (66212711) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 459739 + ... + 459882.

Almost surely, 2^66212712 is an apocalyptic number.

It is an amenable number.

66212712 is an abundant number, since it is smaller than the sum of its proper divisors (113113578).

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

66212712 is a wasteful number, since it uses less digits than its factorization.

66212712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 919633 (or 919626 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 66212712 is about 8137.1193920207. The cubic root of 66212712 is about 404.5576881252.

Adding to 66212712 its reverse (21721266), we get a palindrome (87933978).

The spelling of 66212712 in words is "sixty-six million, two hundred twelve thousand, seven hundred twelve".