521475234557 has 16 divisors (see below), whose sum is σ = 541244965248. Its totient is φ = 502111222080.

The previous prime is 521475234503. The next prime is 521475234587. The reversal of 521475234557 is 755432574125.

It is a cyclic number.

It is not a de Polignac number, because 521475234557 - 2¹⁶ = 521475169021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521475234587) 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 in 15 ways as a sum of consecutive naturals, for example, 1250168 + ... + 1614270.

It is an arithmetic number, because the mean of its divisors is an integer number (33827810328).

Almost surely, 2^521475234557 is an apocalyptic number.

It is an amenable number.

521475234557 is a deficient number, since it is larger than the sum of its proper divisors (19769730691).

521475234557 is a wasteful number, since it uses less digits than its factorization.

521475234557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364660.

The product of its digits is 5880000, while the sum is 50.

The spelling of 521475234557 in words is "five hundred twenty-one billion, four hundred seventy-five million, two hundred thirty-four thousand, five hundred fifty-seven".