505351440421253 has 2 divisors, whose sum is σ = 505351440421254. Its totient is φ = 505351440421252.

The previous prime is 505351440421199. The next prime is 505351440421273. The reversal of 505351440421253 is 352124044153505.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 444382547426689 + 60968892994564 = 21080383^2 + 7808258^2 .

It is a cyclic number.

It is not a de Polignac number, because 505351440421253 - 2²⁰ = 505351439372677 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505351440421273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252675720210626 + 252675720210627.

It is an arithmetic number, because the mean of its divisors is an integer number (252675720210627).

Almost surely, 2^{505351440421253} is an apocalyptic number.

It is an amenable number.

505351440421253 is a deficient number, since it is larger than the sum of its proper divisors (1).

505351440421253 is an equidigital number, since it uses as much as digits as its factorization.

505351440421253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440000, while the sum is 44.

Adding to 505351440421253 its reverse (352124044153505), we get a palindrome (857475484574758).

The spelling of 505351440421253 in words is "five hundred five trillion, three hundred fifty-one billion, four hundred forty million, four hundred twenty-one thousand, two hundred fifty-three".