66628624356 has 144 divisors (see below), whose sum is σ = 205617276480. Its totient is φ = 18593971200.

The previous prime is 66628624339. The next prime is 66628624367. The reversal of 66628624356 is 65342682666.

It is a happy number.

66628624356 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 (54).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 81156 + ... + 373956.

Almost surely, 2^66628624356 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 66628624356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102808638240).

66628624356 is an abundant number, since it is smaller than the sum of its proper divisors (138988652124).

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

66628624356 is a wasteful number, since it uses less digits than its factorization.

66628624356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292871 (or 292856 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 54.

The spelling of 66628624356 in words is "sixty-six billion, six hundred twenty-eight million, six hundred twenty-four thousand, three hundred fifty-six".