66630905250 has 256 divisors, whose sum is σ = 215467499520. Its totient is φ = 13318214400.

The previous prime is 66630905239. The next prime is 66630905251. The reversal of 66630905250 is 5250903666.

66630905250 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (66630905251) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1271059 + ... + 1322441.

It is an arithmetic number, because the mean of its divisors is an integer number (841669920).

Almost surely, 2^66630905250 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66630905250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107733749760).

66630905250 is an abundant number, since it is smaller than the sum of its proper divisors (148836594270).

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

66630905250 is a wasteful number, since it uses less digits than its factorization.

66630905250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51442 (or 51432 counting only the distinct ones).

The product of its (nonzero) digits is 291600, while the sum is 42.

The spelling of 66630905250 in words is "sixty-six billion, six hundred thirty million, nine hundred five thousand, two hundred fifty".