675205975521 has 80 divisors (see below), whose sum is σ = 1286771785728. Its totient is φ = 342599090400.

The previous prime is 675205975519. The next prime is 675205975529. The reversal of 675205975521 is 125579502576.

675205975521 is a `hidden beast` number, since 6 + 7 + 5 + 20 + 5 + 97 + 5 + 521 = 666.

It is not a de Polignac number, because 675205975521 - 2¹ = 675205975519 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (675205975529) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 990625 + ... + 1527006.

Almost surely, 2^675205975521 is an apocalyptic number.

It is an amenable number.

675205975521 is a deficient number, since it is larger than the sum of its proper divisors (611565810207).

675205975521 is a wasteful number, since it uses less digits than its factorization.

675205975521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2517704 (or 2517695 counting only the distinct ones).

The product of its (nonzero) digits is 6615000, while the sum is 54.

The spelling of 675205975521 in words is "six hundred seventy-five billion, two hundred five million, nine hundred seventy-five thousand, five hundred twenty-one".