505646041021 has 12 divisors (see below), whose sum is σ = 564904120732. Its totient is φ = 452142504000.

The previous prime is 505646041009. The next prime is 505646041093. The reversal of 505646041021 is 120140646505.

It can be written as a sum of positive squares in 2 ways, for example, as 239890325796 + 265755715225 = 489786^2 + 515515^2 .

It is not a de Polignac number, because 505646041021 - 2¹⁵ = 505646008253 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 (505646041001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34245840 + ... + 34260601.

Almost surely, 2^505646041021 is an apocalyptic number.

It is an amenable number.

505646041021 is a deficient number, since it is larger than the sum of its proper divisors (59258079711).

505646041021 is a wasteful number, since it uses less digits than its factorization.

505646041021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68506524 (or 68506513 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 505646041021 its reverse (120140646505), we get a palindrome (625786687526).

The spelling of 505646041021 in words is "five hundred five billion, six hundred forty-six million, forty-one thousand, twenty-one".