66553321120 has 384 divisors, whose sum is σ = 191103349248. Its totient is φ = 21581414400.

The previous prime is 66553321099. The next prime is 66553321129. The reversal of 66553321120 is 2112335566.

It is not an unprimeable number, because it can be changed into a prime (66553321129) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 86097054 + ... + 86097826.

It is an arithmetic number, because the mean of its divisors is an integer number (497664972).

Almost surely, 2^66553321120 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66553321120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95551674624).

66553321120 is an abundant number, since it is smaller than the sum of its proper divisors (124550028128).

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

66553321120 is a wasteful number, since it uses less digits than its factorization.

66553321120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 936 (or 928 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 34.

Adding to 66553321120 its reverse (2112335566), we get a palindrome (68665656686).

The spelling of 66553321120 in words is "sixty-six billion, five hundred fifty-three million, three hundred twenty-one thousand, one hundred twenty".