505404521617 has 2 divisors, whose sum is σ = 505404521618. Its totient is φ = 505404521616.

The previous prime is 505404521569. The next prime is 505404521669. The reversal of 505404521617 is 716125404505.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393591862161 + 111812659456 = 627369^2 + 334384^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505404521617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 505404521617.

It is not a weakly prime, because it can be changed into another prime (505404521417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252702260808 + 252702260809.

It is an arithmetic number, because the mean of its divisors is an integer number (252702260809).

Almost surely, 2^505404521617 is an apocalyptic number.

It is an amenable number.

505404521617 is a deficient number, since it is larger than the sum of its proper divisors (1).

505404521617 is an equidigital number, since it uses as much as digits as its factorization.

505404521617 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168000, while the sum is 40.

The spelling of 505404521617 in words is "five hundred five billion, four hundred four million, five hundred twenty-one thousand, six hundred seventeen".