66881200996 has 27 divisors (see below), whose sum is σ = 117832145977. Its totient is φ = 33216382160.

The previous prime is 66881200993. The next prime is 66881201033. The reversal of 66881200996 is 69900218866.

The square root of 66881200996 is 258614.

It is a perfect power (a square), and thus also a powerful number.

66881200996 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 66486622500 + 394578496 = 257850^2 + 19864^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66881200993) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 98790210 + ... + 98790886.

Almost surely, 2^66881200996 is an apocalyptic number.

66881200996 is the 258614-th square number.

It is an amenable number.

66881200996 is a deficient number, since it is larger than the sum of its proper divisors (50950944981).

66881200996 is an frugal number, since it uses more digits than its factorization.

66881200996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 55.

The spelling of 66881200996 in words is "sixty-six billion, eight hundred eighty-one million, two hundred thousand, nine hundred ninety-six".