66611061800 has 24 divisors (see below), whose sum is σ = 154870719150. Its totient is φ = 26644424640.

The previous prime is 66611061793. The next prime is 66611061817. The reversal of 66611061800 is 816011666.

It can be written as a sum of positive squares in 3 ways, for example, as 63662354596 + 2948707204 = 252314^2 + 54302^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 166527455 + ... + 166527854.

Almost surely, 2^66611061800 is an apocalyptic number.

It is an amenable number.

66611061800 is an abundant number, since it is smaller than the sum of its proper divisors (88259657350).

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

66611061800 is a wasteful number, since it uses less digits than its factorization.

66611061800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333055325 (or 333055316 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The spelling of 66611061800 in words is "sixty-six billion, six hundred eleven million, sixty-one thousand, eight hundred".