668158 has 8 divisors (see below), whose sum is σ = 1005840. Its totient is φ = 332880.

The previous prime is 668153. The next prime is 668159. The reversal of 668158 is 851866.

It is a happy number.

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

It is a super-2 number, since 2×668158² = 892870225928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 498 + ... + 1258.

It is an arithmetic number, because the mean of its divisors is an integer number (125730).

2⁶⁶⁸¹⁵⁸ is an apocalyptic number.

668158 is a deficient number, since it is larger than the sum of its proper divisors (337682).

668158 is a wasteful number, since it uses less digits than its factorization.

668158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1202.

The product of its digits is 11520, while the sum is 34.

The square root of 668158 is about 817.4093221881. The cubic root of 668158 is about 87.4231379445.

The spelling of 668158 in words is "six hundred sixty-eight thousand, one hundred fifty-eight".