66649550166210 has 64 divisors (see below), whose sum is σ = 174726385787520. Its totient is φ = 16136564359680.

The previous prime is 66649550166191. The next prime is 66649550166217. The reversal of 66649550166210 is 1266105594666.

It is not an unprimeable number, because it can be changed into a prime (66649550166217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 130384195 + ... + 130894374.

It is an arithmetic number, because the mean of its divisors is an integer number (2730099777930).

Almost surely, 2^{66649550166210} is an apocalyptic number.

66649550166210 is an abundant number, since it is smaller than the sum of its proper divisors (108076835621310).

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

66649550166210 is a wasteful number, since it uses less digits than its factorization.

66649550166210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261279363.

The product of its (nonzero) digits is 13996800, while the sum is 57.

The spelling of 66649550166210 in words is "sixty-six trillion, six hundred forty-nine billion, five hundred fifty million, one hundred sixty-six thousand, two hundred ten".