521345066504 has 32 divisors (see below), whose sum is σ = 1007156511000. Its totient is φ = 252880522752.

The previous prime is 521345066371. The next prime is 521345066527. The reversal of 521345066504 is 405660543125.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 271243056100 + 250102010404 = 520810^2 + 500102^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6870059 + ... + 6945530.

Almost surely, 2^521345066504 is an apocalyptic number.

It is an amenable number.

521345066504 is a deficient number, since it is larger than the sum of its proper divisors (485811444496).

521345066504 is a wasteful number, since it uses less digits than its factorization.

521345066504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13815737 (or 13815733 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

The spelling of 521345066504 in words is "five hundred twenty-one billion, three hundred forty-five million, sixty-six thousand, five hundred four".