66446861216 has 36 divisors (see below), whose sum is σ = 135173358306. Its totient is φ = 32151692160.

The previous prime is 66446861209. The next prime is 66446861267. The reversal of 66446861216 is 61216864466.

It can be written as a sum of positive squares in only one way, i.e., 41607840400 + 24839020816 = 203980^2 + 157604^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1049615 + ... + 1111118.

Almost surely, 2^66446861216 is an apocalyptic number.

It is an amenable number.

66446861216 is an abundant number, since it is smaller than the sum of its proper divisors (68726497090).

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

66446861216 is a wasteful number, since it uses less digits than its factorization.

66446861216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2160805 (or 2160766 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 50.

The spelling of 66446861216 in words is "sixty-six billion, four hundred forty-six million, eight hundred sixty-one thousand, two hundred sixteen".