665110123 has 4 divisors (see below), whose sum is σ = 665195328. Its totient is φ = 665024920.

The previous prime is 665110109. The next prime is 665110141. The reversal of 665110123 is 321011566.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-665110123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665110183) 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, 29563 + ... + 46948.

It is an arithmetic number, because the mean of its divisors is an integer number (166298832).

Almost surely, 2^665110123 is an apocalyptic number.

665110123 is a deficient number, since it is larger than the sum of its proper divisors (85205).

665110123 is an equidigital number, since it uses as much as digits as its factorization.

665110123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85204.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 665110123 is about 25789.7290214535. The cubic root of 665110123 is about 872.9000518452.

Adding to 665110123 its reverse (321011566), we get a palindrome (986121689).

The spelling of 665110123 in words is "six hundred sixty-five million, one hundred ten thousand, one hundred twenty-three".