505660123 has 4 divisors (see below), whose sum is σ = 512587048. Its totient is φ = 498733200.

The previous prime is 505660117. The next prime is 505660157. The reversal of 505660123 is 321066505.

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 505660123 - 2²¹ = 503562971 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505660091 and 505660100.

It is not an unprimeable number, because it can be changed into a prime (505669123) 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, 3463353 + ... + 3463498.

It is an arithmetic number, because the mean of its divisors is an integer number (128146762).

Almost surely, 2^505660123 is an apocalyptic number.

505660123 is a deficient number, since it is larger than the sum of its proper divisors (6926925).

505660123 is an equidigital number, since it uses as much as digits as its factorization.

505660123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6926924.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 505660123 is about 22486.8878015612. The cubic root of 505660123 is about 796.6842570262.

The spelling of 505660123 in words is "five hundred five million, six hundred sixty thousand, one hundred twenty-three".