66116555660 has 12 divisors (see below), whose sum is σ = 138844766928. Its totient is φ = 26446622256.

The previous prime is 66116555647. The next prime is 66116555671. The reversal of 66116555660 is 6655561166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1652913872 + ... + 1652913911.

It is an arithmetic number, because the mean of its divisors is an integer number (11570397244).

Almost surely, 2^66116555660 is an apocalyptic number.

It is an amenable number.

66116555660 is an abundant number, since it is smaller than the sum of its proper divisors (72728211268).

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

66116555660 is a wasteful number, since it uses less digits than its factorization.

66116555660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305827792 (or 3305827790 counting only the distinct ones).

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 66116555660 in words is "sixty-six billion, one hundred sixteen million, five hundred fifty-five thousand, six hundred sixty".