521247686742073 has 2 divisors, whose sum is σ = 521247686742074. Its totient is φ = 521247686742072.

The previous prime is 521247686742059. The next prime is 521247686742169. The reversal of 521247686742073 is 370247686742125.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 283081062450169 + 238166624291904 = 16825013^2 + 15432648^2 .

It is a cyclic number.

It is not a de Polignac number, because 521247686742073 - 2²⁵ = 521247653187641 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 521247686741996 and 521247686742014.

It is not a weakly prime, because it can be changed into another prime (521247686742373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260623843371036 + 260623843371037.

It is an arithmetic number, because the mean of its divisors is an integer number (260623843371037).

Almost surely, 2^{521247686742073} is an apocalyptic number.

It is an amenable number.

521247686742073 is a deficient number, since it is larger than the sum of its proper divisors (1).

521247686742073 is an equidigital number, since it uses as much as digits as its factorization.

521247686742073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189665280, while the sum is 64.

The spelling of 521247686742073 in words is "five hundred twenty-one trillion, two hundred forty-seven billion, six hundred eighty-six million, seven hundred forty-two thousand, seventy-three".