6661123 has 4 divisors (see below), whose sum is σ = 7612720. Its totient is φ = 5709528.

The previous prime is 6661117. The next prime is 6661141. The reversal of 6661123 is 3211666.

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 6661123 - 2⁵ = 6661091 is a prime.

It is a super-2 number, since 2×6661123² = 88741119242258, which contains 22 as substring.

It is a Duffinian number.

6661123 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6661103) 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, 475788 + ... + 475801.

It is an arithmetic number, because the mean of its divisors is an integer number (1903180).

Almost surely, 2^6661123 is an apocalyptic number.

6661123 is a deficient number, since it is larger than the sum of its proper divisors (951597).

6661123 is an equidigital number, since it uses as much as digits as its factorization.

6661123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 951596.

The product of its digits is 1296, while the sum is 25.

The square root of 6661123 is about 2580.9151477722. The cubic root of 6661123 is about 188.1550234088.

Adding to 6661123 its reverse (3211666), we get a palindrome (9872789).

The spelling of 6661123 in words is "six million, six hundred sixty-one thousand, one hundred twenty-three".