166566115205215 has 16 divisors (see below), whose sum is σ = 218050926704640. Its totient is φ = 121138582028320.

The previous prime is 166566115205129. The next prime is 166566115205249. The reversal of 166566115205215 is 512502511665661.

It is not a de Polignac number, because 166566115205215 - 2¹⁵ = 166566115172447 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11727462 + ... + 21694828.

It is an arithmetic number, because the mean of its divisors is an integer number (13628182919040).

Almost surely, 2^{166566115205215} is an apocalyptic number.

166566115205215 is a deficient number, since it is larger than the sum of its proper divisors (51484811499425).

166566115205215 is a wasteful number, since it uses less digits than its factorization.

166566115205215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10271222.

The product of its (nonzero) digits is 3240000, while the sum is 52.

The spelling of 166566115205215 in words is "one hundred sixty-six trillion, five hundred sixty-six billion, one hundred fifteen million, two hundred five thousand, two hundred fifteen".