505365435621 has 6 divisors (see below), whose sum is σ = 729972295910. Its totient is φ = 336910290408.

The previous prime is 505365435593. The next prime is 505365435623. The reversal of 505365435621 is 126534563505.

505365435621 is a `hidden beast` number, since 5 + 0 + 5 + 36 + 54 + 3 + 562 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 335362601025 + 170002834596 = 579105^2 + 412314^2 .

It is not a de Polignac number, because 505365435621 - 2¹⁸ = 505365173477 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 (505365435623) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28075857526 + ... + 28075857543.

Almost surely, 2^505365435621 is an apocalyptic number.

It is an amenable number.

505365435621 is a deficient number, since it is larger than the sum of its proper divisors (224606860289).

505365435621 is a wasteful number, since it uses less digits than its factorization.

505365435621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56151715075 (or 56151715072 counting only the distinct ones).

The product of its (nonzero) digits is 1620000, while the sum is 45.

The spelling of 505365435621 in words is "five hundred five billion, three hundred sixty-five million, four hundred thirty-five thousand, six hundred twenty-one".