166516523 has 4 divisors (see below), whose sum is σ = 166674528. Its totient is φ = 166358520.

The previous prime is 166516517. The next prime is 166516529. The reversal of 166516523 is 325615661.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (166516517) and next prime (166516529).

It is a cyclic number.

It is not a de Polignac number, because 166516523 - 2¹⁰ = 166515499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166516529) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 77411 + ... + 79532.

It is an arithmetic number, because the mean of its divisors is an integer number (41668632).

Almost surely, 2^166516523 is an apocalyptic number.

166516523 is a deficient number, since it is larger than the sum of its proper divisors (158005).

166516523 is a wasteful number, since it uses less digits than its factorization.

166516523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158004.

The product of its digits is 32400, while the sum is 35.

The square root of 166516523 is about 12904.1281379255. The cubic root of 166516523 is about 550.1559040124.

The spelling of 166516523 in words is "one hundred sixty-six million, five hundred sixteen thousand, five hundred twenty-three".