66217575012 has 24 divisors (see below), whose sum is σ = 155053646496. Its totient is φ = 21994529088.

The previous prime is 66217574999. The next prime is 66217575019. The reversal of 66217575012 is 21057571266.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66217575019) 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, 9745953 + ... + 9752744.

It is an arithmetic number, because the mean of its divisors is an integer number (6460568604).

Almost surely, 2^66217575012 is an apocalyptic number.

It is an amenable number.

66217575012 is an abundant number, since it is smaller than the sum of its proper divisors (88836071484).

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

66217575012 is a wasteful number, since it uses less digits than its factorization.

66217575012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19498987 (or 19498985 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 42.

The spelling of 66217575012 in words is "sixty-six billion, two hundred seventeen million, five hundred seventy-five thousand, twelve".