166541555 has 8 divisors (see below), whose sum is σ = 210368400. Its totient is φ = 126220896.

The previous prime is 166541533. The next prime is 166541569. The reversal of 166541555 is 555145661.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166541555 - 2¹⁴ = 166525171 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 876440 + ... + 876629.

It is an arithmetic number, because the mean of its divisors is an integer number (26296050).

Almost surely, 2^166541555 is an apocalyptic number.

166541555 is a deficient number, since it is larger than the sum of its proper divisors (43826845).

166541555 is a wasteful number, since it uses less digits than its factorization.

166541555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1753093.

The product of its digits is 90000, while the sum is 38.

The square root of 166541555 is about 12905.0980236494. The cubic root of 166541555 is about 550.1834704711.

The spelling of 166541555 in words is "one hundred sixty-six million, five hundred forty-one thousand, five hundred fifty-five".