505124124134405 has 4 divisors (see below), whose sum is σ = 606148948961292. Its totient is φ = 404099299307520.

The previous prime is 505124124134359. The next prime is 505124124134407. The reversal of 505124124134405 is 504431421421505.

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

It can be written as a sum of positive squares in 2 ways, for example, as 401201941560676 + 103922182573729 = 20030026^2 + 10194223^2 .

It is a de Polignac number, because none of the positive numbers 2^k-505124124134405 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 (505124124134407) 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, 50512412413436 + ... + 50512412413445.

It is an arithmetic number, because the mean of its divisors is an integer number (151537237240323).

Almost surely, 2^{505124124134405} is an apocalyptic number.

It is an amenable number.

505124124134405 is a deficient number, since it is larger than the sum of its proper divisors (101024824826887).

505124124134405 is a wasteful number, since it uses less digits than its factorization.

505124124134405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101024824826886.

The product of its (nonzero) digits is 384000, while the sum is 41.

The spelling of 505124124134405 in words is "five hundred five trillion, one hundred twenty-four billion, one hundred twenty-four million, one hundred thirty-four thousand, four hundred five".