505240502123 has 4 divisors (see below), whose sum is σ = 577417716720. Its totient is φ = 433063287528.

The previous prime is 505240501999. The next prime is 505240502183. The reversal of 505240502123 is 321205042505.

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 505240502123 - 2¹⁶ = 505240436587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505240502183) 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, 36088607288 + ... + 36088607301.

It is an arithmetic number, because the mean of its divisors is an integer number (144354429180).

Almost surely, 2^505240502123 is an apocalyptic number.

505240502123 is a deficient number, since it is larger than the sum of its proper divisors (72177214597).

505240502123 is an equidigital number, since it uses as much as digits as its factorization.

505240502123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72177214596.

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 505240502123 its reverse (321205042505), we get a palindrome (826445544628).

The spelling of 505240502123 in words is "five hundred five billion, two hundred forty million, five hundred two thousand, one hundred twenty-three".