166665626 has 8 divisors (see below), whose sum is σ = 250129620. Its totient is φ = 83289088.

The previous prime is 166665601. The next prime is 166665683. The reversal of 166665626 is 626566661.

It can be written as a sum of positive squares in 2 ways, for example, as 114811225 + 51854401 = 10715^2 + 7201^2 .

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

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 3 ways as a sum of consecutive naturals, for example, 16871 + ... + 24858.

Almost surely, 2^166665626 is an apocalyptic number.

166665626 is a deficient number, since it is larger than the sum of its proper divisors (83463994).

166665626 is a wasteful number, since it uses less digits than its factorization.

166665626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43728.

The product of its digits is 466560, while the sum is 44.

The square root of 166665626 is about 12909.9041824485. The cubic root of 166665626 is about 550.3200627448.

The spelling of 166665626 in words is "one hundred sixty-six million, six hundred sixty-five thousand, six hundred twenty-six".