166521060655 has 16 divisors (see below), whose sum is σ = 202829529600. Its totient is φ = 131214438432.

The previous prime is 166521060623. The next prime is 166521060683. The reversal of 166521060655 is 556060125661.

It is a cyclic number.

It is not a de Polignac number, because 166521060655 - 2⁵ = 166521060623 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4001646 + ... + 4043044.

It is an arithmetic number, because the mean of its divisors is an integer number (12676845600).

Almost surely, 2^166521060655 is an apocalyptic number.

166521060655 is a deficient number, since it is larger than the sum of its proper divisors (36308468945).

166521060655 is a wasteful number, since it uses less digits than its factorization.

166521060655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53478.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 166521060655 in words is "one hundred sixty-six billion, five hundred twenty-one million, sixty thousand, six hundred fifty-five".