505555005521 has 2 divisors, whose sum is σ = 505555005522. Its totient is φ = 505555005520.

The previous prime is 505555005503. The next prime is 505555005547. The reversal of 505555005521 is 125500555505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 448451212225 + 57103793296 = 669665^2 + 238964^2 .

It is a cyclic number.

It is not a de Polignac number, because 505555005521 - 2⁶ = 505555005457 is a prime.

It is not a weakly prime, because it can be changed into another prime (505555005581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252777502760 + 252777502761.

It is an arithmetic number, because the mean of its divisors is an integer number (252777502761).

Almost surely, 2^505555005521 is an apocalyptic number.

It is an amenable number.

505555005521 is a deficient number, since it is larger than the sum of its proper divisors (1).

505555005521 is an equidigital number, since it uses as much as digits as its factorization.

505555005521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 156250, while the sum is 38.

The spelling of 505555005521 in words is "five hundred five billion, five hundred fifty-five million, five thousand, five hundred twenty-one".