505440355023 has 24 divisors (see below), whose sum is σ = 774728002048. Its totient is φ = 329123945304.

The previous prime is 505440354931. The next prime is 505440355087. The reversal of 505440355023 is 320553044505.

505440355023 is a `hidden beast` number, since 50 + 54 + 4 + 0 + 3 + 550 + 2 + 3 = 666.

It is not a de Polignac number, because 505440355023 - 2²⁴ = 505423577807 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 (505440355093) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24175615 + ... + 24196512.

Almost surely, 2^505440355023 is an apocalyptic number.

505440355023 is a deficient number, since it is larger than the sum of its proper divisors (269287647025).

505440355023 is an equidigital number, since it uses as much as digits as its factorization.

505440355023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48372185 (or 48372173 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 36.

Adding to 505440355023 its reverse (320553044505), we get a palindrome (825993399528).

The spelling of 505440355023 in words is "five hundred five billion, four hundred forty million, three hundred fifty-five thousand, twenty-three".