505021716953 has 4 divisors (see below), whose sum is σ = 543869541348. Its totient is φ = 466173892560.

The previous prime is 505021716907. The next prime is 505021716961. The reversal of 505021716953 is 359617120505.

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 323211579289 + 181810137664 = 568517^2 + 426392^2 .

It is a cyclic number.

It is not a de Polignac number, because 505021716953 - 2¹⁸ = 505021454809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505021716653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19423912178 + ... + 19423912203.

It is an arithmetic number, because the mean of its divisors is an integer number (135967385337).

Almost surely, 2^505021716953 is an apocalyptic number.

It is an amenable number.

505021716953 is a deficient number, since it is larger than the sum of its proper divisors (38847824395).

505021716953 is a wasteful number, since it uses less digits than its factorization.

505021716953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38847824394.

The product of its (nonzero) digits is 283500, while the sum is 44.

The spelling of 505021716953 in words is "five hundred five billion, twenty-one million, seven hundred sixteen thousand, nine hundred fifty-three".