668500123 has 4 divisors (see below), whose sum is σ = 703684360. Its totient is φ = 633315888.

The previous prime is 668500081. The next prime is 668500171. The reversal of 668500123 is 321005866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 668500123 - 2¹³ = 668491931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668507123) 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, 17592090 + ... + 17592127.

It is an arithmetic number, because the mean of its divisors is an integer number (175921090).

Almost surely, 2^668500123 is an apocalyptic number.

668500123 is a deficient number, since it is larger than the sum of its proper divisors (35184237).

668500123 is a wasteful number, since it uses less digits than its factorization.

668500123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35184236.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 668500123 is about 25855.3693263121. The cubic root of 668500123 is about 874.3805675251.

Adding to 668500123 its reverse (321005866), we get a palindrome (989505989).

The spelling of 668500123 in words is "six hundred sixty-eight million, five hundred thousand, one hundred twenty-three".