66620756224 has 144 divisors (see below), whose sum is σ = 151178328000. Its totient is φ = 29022658560.

The previous prime is 66620756219. The next prime is 66620756249. The reversal of 66620756224 is 42265702666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11348362 + ... + 11354230.

It is an arithmetic number, because the mean of its divisors is an integer number (1049849500).

Almost surely, 2^66620756224 is an apocalyptic number.

66620756224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66620756224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75589164000).

66620756224 is an abundant number, since it is smaller than the sum of its proper divisors (84557571776).

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

66620756224 is a wasteful number, since it uses less digits than its factorization.

66620756224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6064 (or 6050 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 46.

The spelling of 66620756224 in words is "sixty-six billion, six hundred twenty million, seven hundred fifty-six thousand, two hundred twenty-four".