166525603 has 4 divisors (see below), whose sum is σ = 166685400. Its totient is φ = 166365808.

The previous prime is 166525573. The next prime is 166525607. The reversal of 166525603 is 306525661.

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

It is a cyclic number.

It is not a de Polignac number, because 166525603 - 2⁵ = 166525571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166525607) 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, 78325 + ... + 80422.

It is an arithmetic number, because the mean of its divisors is an integer number (41671350).

Almost surely, 2^166525603 is an apocalyptic number.

166525603 is a deficient number, since it is larger than the sum of its proper divisors (159797).

166525603 is a wasteful number, since it uses less digits than its factorization.

166525603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159796.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 166525603 is about 12904.4799585260. The cubic root of 166525603 is about 550.1659036703.

The spelling of 166525603 in words is "one hundred sixty-six million, five hundred twenty-five thousand, six hundred three".