205120070061666 has 16 divisors (see below), whose sum is σ = 410346613084224. Its totient is φ = 68355611193744.

The previous prime is 205120070061619. The next prime is 205120070061667. The reversal of 205120070061666 is 666160070021502.

It is not an unprimeable number, because it can be changed into a prime (205120070061667) 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, 4436348326 + ... + 4436394561.

It is an arithmetic number, because the mean of its divisors is an integer number (25646663317764).

Almost surely, 2^{205120070061666} is an apocalyptic number.

205120070061666 is an abundant number, since it is smaller than the sum of its proper divisors (205226543022558).

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

205120070061666 is a wasteful number, since it uses less digits than its factorization.

205120070061666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8872746745.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 205120070061666 in words is "two hundred five trillion, one hundred twenty billion, seventy million, sixty-one thousand, six hundred sixty-six".