521543663612 has 24 divisors (see below), whose sum is σ = 967966299216. Its totient is φ = 245031913728.

The previous prime is 521543663611. The next prime is 521543663617. The reversal of 521543663612 is 216366345125.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521543663611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6214238 + ... + 6297605.

It is an arithmetic number, because the mean of its divisors is an integer number (40331929134).

Almost surely, 2^521543663612 is an apocalyptic number.

It is an amenable number.

521543663612 is a deficient number, since it is larger than the sum of its proper divisors (446422635604).

521543663612 is a wasteful number, since it uses less digits than its factorization.

521543663612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12512477 (or 12512475 counting only the distinct ones).

The product of its digits is 777600, while the sum is 44.

The spelling of 521543663612 in words is "five hundred twenty-one billion, five hundred forty-three million, six hundred sixty-three thousand, six hundred twelve".