66556216036 has 24 divisors (see below), whose sum is σ = 117825362424. Its totient is φ = 32892940800.

The previous prime is 66556216031. The next prime is 66556216039. The reversal of 66556216036 is 63061265566.

It can be written as a sum of positive squares in 4 ways, for example, as 46971892900 + 19584323136 = 216730^2 + 139944^2 .

It is not an unprimeable number, because it can be changed into a prime (66556216031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100666 + ... + 378478.

It is an arithmetic number, because the mean of its divisors is an integer number (4909390101).

Almost surely, 2^66556216036 is an apocalyptic number.

It is an amenable number.

66556216036 is a deficient number, since it is larger than the sum of its proper divisors (51269146388).

66556216036 is a wasteful number, since it uses less digits than its factorization.

66556216036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278511 (or 278509 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 46.

The spelling of 66556216036 in words is "sixty-six billion, five hundred fifty-six million, two hundred sixteen thousand, thirty-six".