66218012200 has 48 divisors (see below), whose sum is σ = 154340997660. Its totient is φ = 26421120000.

The previous prime is 66218012177. The next prime is 66218012227. The reversal of 66218012200 is 221081266.

It can be written as a sum of positive squares in 6 ways, for example, as 55180828836 + 11037183364 = 234906^2 + 105058^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 332631 + ... + 493030.

Almost surely, 2^66218012200 is an apocalyptic number.

It is an amenable number.

66218012200 is an abundant number, since it is smaller than the sum of its proper divisors (88122985460).

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

66218012200 is a wasteful number, since it uses less digits than its factorization.

66218012200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 826078 (or 826069 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

Adding to 66218012200 its reverse (221081266), we get a palindrome (66439093466).

The spelling of 66218012200 in words is "sixty-six billion, two hundred eighteen million, twelve thousand, two hundred".