166668559 has 8 divisors (see below), whose sum is σ = 172058832. Its totient is φ = 161347200.

The previous prime is 166668553. The next prime is 166668571. The reversal of 166668559 is 955866661.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166668559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166668553) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12292 + ... + 22009.

It is an arithmetic number, because the mean of its divisors is an integer number (21507354).

Almost surely, 2^166668559 is an apocalyptic number.

166668559 is a deficient number, since it is larger than the sum of its proper divisors (5390273).

166668559 is a wasteful number, since it uses less digits than its factorization.

166668559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34457.

The product of its digits is 2332800, while the sum is 52.

The square root of 166668559 is about 12910.0177769049. The cubic root of 166668559 is about 550.3232909236.

It can be divided in two parts, 1666 and 68559, that added together give a square (70225 = 265²).

The spelling of 166668559 in words is "one hundred sixty-six million, six hundred sixty-eight thousand, five hundred fifty-nine".