66712122 has 48 divisors (see below), whose sum is σ = 150452640. Its totient is φ = 21338016.

The previous prime is 66712099. The next prime is 66712123. The reversal of 66712122 is 22121766.

It is not an unprimeable number, because it can be changed into a prime (66712123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118213 + ... + 118775.

It is an arithmetic number, because the mean of its divisors is an integer number (3134430).

Almost surely, 2^66712122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66712122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75226320).

66712122 is an abundant number, since it is smaller than the sum of its proper divisors (83740518).

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

66712122 is a wasteful number, since it uses less digits than its factorization.

66712122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827 (or 824 counting only the distinct ones).

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

The square root of 66712122 is about 8167.7488942793. The cubic root of 66712122 is about 405.5722682742.

Adding to 66712122 its reverse (22121766), we get a palindrome (88833888).

The spelling of 66712122 in words is "sixty-six million, seven hundred twelve thousand, one hundred twenty-two".