66566703752 has 16 divisors (see below), whose sum is σ = 132154485660. Its totient is φ = 31325507584.

The previous prime is 66566703743. The next prime is 66566703829. The reversal of 66566703752 is 25730766566.

It can be written as a sum of positive squares in 2 ways, for example, as 66453621796 + 113081956 = 257786^2 + 10634^2 .

It is a super-2 number, since 2×66566703752² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66566703694 and 66566703703.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244730393 + ... + 244730664.

Almost surely, 2^66566703752 is an apocalyptic number.

It is an amenable number.

66566703752 is a deficient number, since it is larger than the sum of its proper divisors (65587781908).

66566703752 is a wasteful number, since it uses less digits than its factorization.

66566703752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489461080 (or 489461076 counting only the distinct ones).

The product of its (nonzero) digits is 9525600, while the sum is 53.

The spelling of 66566703752 in words is "sixty-six billion, five hundred sixty-six million, seven hundred three thousand, seven hundred fifty-two".