66552320212 has 24 divisors (see below), whose sum is σ = 133157001600. Its totient is φ = 28511202720.

The previous prime is 66552320203. The next prime is 66552320213. The reversal of 66552320212 is 21202325566.

It is a super-2 number, since 2×66552320212² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66552320213) 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, 394864 + ... + 537607.

It is an arithmetic number, because the mean of its divisors is an integer number (5548208400).

Almost surely, 2^66552320212 is an apocalyptic number.

It is an amenable number.

66552320212 is an abundant number, since it is smaller than the sum of its proper divisors (66604681388).

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

66552320212 is a wasteful number, since it uses less digits than its factorization.

66552320212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935031 (or 935029 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

Adding to 66552320212 its reverse (21202325566), we get a palindrome (87754645778).

The spelling of 66552320212 in words is "sixty-six billion, five hundred fifty-two million, three hundred twenty thousand, two hundred twelve".