521816204053 has 2 divisors, whose sum is σ = 521816204054. Its totient is φ = 521816204052.

The previous prime is 521816204029. The next prime is 521816204089. The reversal of 521816204053 is 350402618125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 455222788804 + 66593415249 = 674702^2 + 258057^2 .

It is a cyclic number.

It is not a de Polignac number, because 521816204053 - 2⁹ = 521816203541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (521816204023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260908102026 + 260908102027.

It is an arithmetic number, because the mean of its divisors is an integer number (260908102027).

Almost surely, 2^521816204053 is an apocalyptic number.

It is an amenable number.

521816204053 is a deficient number, since it is larger than the sum of its proper divisors (1).

521816204053 is an equidigital number, since it uses as much as digits as its factorization.

521816204053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57600, while the sum is 37.

The spelling of 521816204053 in words is "five hundred twenty-one billion, eight hundred sixteen million, two hundred four thousand, fifty-three".