668143 has 8 divisors (see below), whose sum is σ = 788480. Its totient is φ = 554040.

The previous prime is 668141. The next prime is 668153. The reversal of 668143 is 341866.

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

It is a cyclic number.

It is not a de Polignac number, because 668143 - 2¹ = 668141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668141) 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, 1323 + ... + 1756.

It is an arithmetic number, because the mean of its divisors is an integer number (98560).

2⁶⁶⁸¹⁴³ is an apocalyptic number.

668143 is a deficient number, since it is larger than the sum of its proper divisors (120337).

668143 is a wasteful number, since it uses less digits than its factorization.

668143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3117.

The product of its digits is 3456, while the sum is 28.

The square root of 668143 is about 817.4001468069. The cubic root of 668143 is about 87.4224837295.

It can be divided in two parts, 6681 and 43, that added together give a square (6724 = 82²).

The spelling of 668143 in words is "six hundred sixty-eight thousand, one hundred forty-three".