521885478145673 has 2 divisors, whose sum is σ = 521885478145674. Its totient is φ = 521885478145672.

The previous prime is 521885478145667. The next prime is 521885478145687. The reversal of 521885478145673 is 376541874588125.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 517845912787984 + 4039565357689 = 22756228^2 + 2009867^2 .

It is a cyclic number.

It is not a de Polignac number, because 521885478145673 - 2⁶ = 521885478145609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 521885478145673.

It is not a weakly prime, because it can be changed into another prime (521885478175673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260942739072836 + 260942739072837.

It is an arithmetic number, because the mean of its divisors is an integer number (260942739072837).

Almost surely, 2^{521885478145673} is an apocalyptic number.

It is an amenable number.

521885478145673 is a deficient number, since it is larger than the sum of its proper divisors (1).

521885478145673 is an equidigital number, since it uses as much as digits as its factorization.

521885478145673 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1806336000, while the sum is 74.

The spelling of 521885478145673 in words is "five hundred twenty-one trillion, eight hundred eighty-five billion, four hundred seventy-eight million, one hundred forty-five thousand, six hundred seventy-three".