66366570528 has 72 divisors (see below), whose sum is σ = 195237888300. Its totient is φ = 21359353344.

The previous prime is 66366570527. The next prime is 66366570533. The reversal of 66366570528 is 82507566366.

It is a happy number.

66366570528 is a `hidden beast` number, since 6 + 6 + 3 + 66 + 57 + 0 + 528 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 66063392784 + 303177744 = 257028^2 + 17412^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (66366570527) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3964743 + ... + 3981446.

Almost surely, 2^66366570528 is an apocalyptic number.

It is an amenable number.

66366570528 is an abundant number, since it is smaller than the sum of its proper divisors (128871317772).

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

66366570528 is a wasteful number, since it uses less digits than its factorization.

66366570528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7946234 (or 7946223 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 54.

The spelling of 66366570528 in words is "sixty-six billion, three hundred sixty-six million, five hundred seventy thousand, five hundred twenty-eight".