505544240521 has 2 divisors, whose sum is σ = 505544240522. Its totient is φ = 505544240520.

The previous prime is 505544240519. The next prime is 505544240563. The reversal of 505544240521 is 125042445505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 394679215225 + 110865025296 = 628235^2 + 332964^2 .

It is a cyclic number.

It is not a de Polignac number, because 505544240521 - 2¹ = 505544240519 is a prime.

Together with 505544240519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (505544240021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252772120260 + 252772120261.

It is an arithmetic number, because the mean of its divisors is an integer number (252772120261).

Almost surely, 2^505544240521 is an apocalyptic number.

It is an amenable number.

505544240521 is a deficient number, since it is larger than the sum of its proper divisors (1).

505544240521 is an equidigital number, since it uses as much as digits as its factorization.

505544240521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160000, while the sum is 37.

The spelling of 505544240521 in words is "five hundred five billion, five hundred forty-four million, two hundred forty thousand, five hundred twenty-one".