166206623 has 16 divisors (see below), whose sum is σ = 191289600. Its totient is φ = 142822080.

The previous prime is 166206613. The next prime is 166206629. The reversal of 166206623 is 326602661.

It is a cyclic number.

It is not a de Polignac number, because 166206623 - 2⁶ = 166206559 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166206623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166206629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168590 + ... + 169572.

It is an arithmetic number, because the mean of its divisors is an integer number (11955600).

Almost surely, 2^166206623 is an apocalyptic number.

166206623 is a deficient number, since it is larger than the sum of its proper divisors (25082977).

166206623 is a wasteful number, since it uses less digits than its factorization.

166206623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 166206623 is about 12892.1147605814. The cubic root of 166206623 is about 549.8143979802.

The spelling of 166206623 in words is "one hundred sixty-six million, two hundred six thousand, six hundred twenty-three".