66616115600 has 60 divisors (see below), whose sum is σ = 160198796100. Its totient is φ = 26620876800.

The previous prime is 66616115597. The next prime is 66616115639. The reversal of 66616115600 is 651161666.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1919140864 + 64696974736 = 43808^2 + 254356^2 .

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 11 ways as a sum of consecutive naturals, for example, 340220 + ... + 498980.

It is an arithmetic number, because the mean of its divisors is an integer number (2669979935).

Almost surely, 2^66616115600 is an apocalyptic number.

It is an amenable number.

66616115600 is an abundant number, since it is smaller than the sum of its proper divisors (93582680500).

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

66616115600 is a wasteful number, since it uses less digits than its factorization.

66616115600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159828 (or 159817 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The spelling of 66616115600 in words is "sixty-six billion, six hundred sixteen million, one hundred fifteen thousand, six hundred".