6666123103 has 4 divisors (see below), whose sum is σ = 6676490968. Its totient is φ = 6655755240.

The previous prime is 6666123073. The next prime is 6666123109. The reversal of 6666123103 is 3013216666.

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 6666123103 - 2¹³ = 6666114911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666123109) 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, 5182968 + ... + 5184253.

It is an arithmetic number, because the mean of its divisors is an integer number (1669122742).

Almost surely, 2^6666123103 is an apocalyptic number.

6666123103 is a deficient number, since it is larger than the sum of its proper divisors (10367865).

6666123103 is a wasteful number, since it uses less digits than its factorization.

6666123103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10367864.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 6666123103 is about 81646.3293908550. The cubic root of 6666123103 is about 1882.0209050724.

Adding to 6666123103 its reverse (3013216666), we get a palindrome (9679339769).

The spelling of 6666123103 in words is "six billion, six hundred sixty-six million, one hundred twenty-three thousand, one hundred three".