66404331212 has 6 divisors (see below), whose sum is σ = 116207579628. Its totient is φ = 33202165604.

The previous prime is 66404331199. The next prime is 66404331221. The reversal of 66404331212 is 21213340466.

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 as a sum of consecutive naturals, namely, 8300541398 + ... + 8300541405.

It is an arithmetic number, because the mean of its divisors is an integer number (19367929938).

Almost surely, 2^66404331212 is an apocalyptic number.

It is an amenable number.

66404331212 is a deficient number, since it is larger than the sum of its proper divisors (49803248416).

66404331212 is a wasteful number, since it uses less digits than its factorization.

66404331212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16601082807 (or 16601082805 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 66404331212 its reverse (21213340466), we get a palindrome (87617671678).

The spelling of 66404331212 in words is "sixty-six billion, four hundred four million, three hundred thirty-one thousand, two hundred twelve".