667340123 has 4 divisors (see below), whose sum is σ = 667729608. Its totient is φ = 666950640.

The previous prime is 667340099. The next prime is 667340137. The reversal of 667340123 is 321043766.

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 667340123 - 2¹² = 667336027 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 667340123.

It is not an unprimeable number, because it can be changed into a prime (667340623) 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, 192161 + ... + 195602.

It is an arithmetic number, because the mean of its divisors is an integer number (166932402).

Almost surely, 2^667340123 is an apocalyptic number.

667340123 is a deficient number, since it is larger than the sum of its proper divisors (389485).

667340123 is a wasteful number, since it uses less digits than its factorization.

667340123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389484.

The product of its (nonzero) digits is 18144, while the sum is 32.

The square root of 667340123 is about 25832.9271086341. The cubic root of 667340123 is about 873.8745248885.

Adding to 667340123 its reverse (321043766), we get a palindrome (988383889).

The spelling of 667340123 in words is "six hundred sixty-seven million, three hundred forty thousand, one hundred twenty-three".