66531222 has 12 divisors (see below), whose sum is σ = 144151020. Its totient is φ = 22177068.

The previous prime is 66531197. The next prime is 66531229. The reversal of 66531222 is 22213566.

66531222 is a `hidden beast` number, since 6 + 653 + 1 + 2 + 2 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66531229) 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, 1848072 + ... + 1848107.

It is an arithmetic number, because the mean of its divisors is an integer number (12012585).

Almost surely, 2^66531222 is an apocalyptic number.

66531222 is an abundant number, since it is smaller than the sum of its proper divisors (77619798).

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

66531222 is a wasteful number, since it uses less digits than its factorization.

66531222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3696187 (or 3696184 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 66531222 is about 8156.6673341506. The cubic root of 66531222 is about 405.2053462548.

Adding to 66531222 its reverse (22213566), we get a palindrome (88744788).

It can be divided in two parts, 6653 and 1222, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 66531222 in words is "sixty-six million, five hundred thirty-one thousand, two hundred twenty-two".