66606221012 has 24 divisors (see below), whose sum is σ = 119317214016. Its totient is φ = 32516180928.

The previous prime is 66606221009. The next prime is 66606221023. The reversal of 66606221012 is 21012260666.

It is a self number, because there is not a number n which added to its sum of digits gives 66606221012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 385328 + ... + 530744.

It is an arithmetic number, because the mean of its divisors is an integer number (4971550584).

Almost surely, 2^66606221012 is an apocalyptic number.

It is an amenable number.

66606221012 is a deficient number, since it is larger than the sum of its proper divisors (52710993004).

66606221012 is a wasteful number, since it uses less digits than its factorization.

66606221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148127 (or 148125 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

Adding to 66606221012 its reverse (21012260666), we get a palindrome (87618481678).

The spelling of 66606221012 in words is "sixty-six billion, six hundred six million, two hundred twenty-one thousand, twelve".