66531060123320 has 128 divisors (see below), whose sum is σ = 170712129571200. Its totient is φ = 23117679230976.

The previous prime is 66531060123317. The next prime is 66531060123331. The reversal of 66531060123320 is 2332106013566.

It is a super-2 number, since 2×66531060123320² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78510917 + ... + 79353803.

It is an arithmetic number, because the mean of its divisors is an integer number (1333688512275).

Almost surely, 2^{66531060123320} 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 66531060123320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85356064785600).

66531060123320 is an abundant number, since it is smaller than the sum of its proper divisors (104181069447880).

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

66531060123320 is a wasteful number, since it uses less digits than its factorization.

66531060123320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851857 (or 851853 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 38.

Adding to 66531060123320 its reverse (2332106013566), we get a palindrome (68863166136886).

The spelling of 66531060123320 in words is "sixty-six trillion, five hundred thirty-one billion, sixty million, one hundred twenty-three thousand, three hundred twenty".