166606251 has 16 divisors (see below), whose sum is σ = 254056704. Its totient is φ = 95135904.

The previous prime is 166606243. The next prime is 166606261. The reversal of 166606251 is 152606661.

It is not a de Polignac number, because 166606251 - 2³ = 166606243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166606261) 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 15 ways as a sum of consecutive naturals, for example, 54865 + ... + 57821.

It is an arithmetic number, because the mean of its divisors is an integer number (15878544).

Almost surely, 2^166606251 is an apocalyptic number.

166606251 is a deficient number, since it is larger than the sum of its proper divisors (87450453).

166606251 is a wasteful number, since it uses less digits than its factorization.

166606251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5650.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 166606251 is about 12907.6043865622. The cubic root of 166606251 is about 550.2547040673.

The spelling of 166606251 in words is "one hundred sixty-six million, six hundred six thousand, two hundred fifty-one".