668889123 has 32 divisors (see below), whose sum is σ = 1104339456. Its totient is φ = 351364608.

The previous prime is 668889119. The next prime is 668889163. The reversal of 668889123 is 321988866.

It is not a de Polignac number, because 668889123 - 2² = 668889119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (668889163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6436 + ... + 37137.

It is an arithmetic number, because the mean of its divisors is an integer number (34510608).

Almost surely, 2^668889123 is an apocalyptic number.

668889123 is a deficient number, since it is larger than the sum of its proper divisors (435450333).

668889123 is a wasteful number, since it uses less digits than its factorization.

668889123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43643.

The product of its digits is 995328, while the sum is 51.

The square root of 668889123 is about 25862.8908476991. The cubic root of 668889123 is about 874.5501352263.

The spelling of 668889123 in words is "six hundred sixty-eight million, eight hundred eighty-nine thousand, one hundred twenty-three".