521475641421601 has 2 divisors, whose sum is σ = 521475641421602. Its totient is φ = 521475641421600.

The previous prime is 521475641421557. The next prime is 521475641421629. The reversal of 521475641421601 is 106124146574125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 507961489076001 + 13514152345600 = 22538001^2 + 3676160^2 .

It is a cyclic number.

It is not a de Polignac number, because 521475641421601 - 2¹¹ = 521475641419553 is a prime.

It is not a weakly prime, because it can be changed into another prime (521475641421401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260737820710800 + 260737820710801.

It is an arithmetic number, because the mean of its divisors is an integer number (260737820710801).

Almost surely, 2^{521475641421601} is an apocalyptic number.

It is an amenable number.

521475641421601 is a deficient number, since it is larger than the sum of its proper divisors (1).

521475641421601 is an equidigital number, since it uses as much as digits as its factorization.

521475641421601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1612800, while the sum is 49.

Adding to 521475641421601 its reverse (106124146574125), we get a palindrome (627599787995726).

The spelling of 521475641421601 in words is "five hundred twenty-one trillion, four hundred seventy-five billion, six hundred forty-one million, four hundred twenty-one thousand, six hundred one".