285648560521 has 9 divisors (see below), whose sum is σ = 287211778581. Its totient is φ = 284093813472.

The previous prime is 285648560479. The next prime is 285648560557. The reversal of 285648560521 is 125065846582.

The square root of 285648560521 is 534461.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 267070870521 + 18577690000 = 516789^2 + 136300^2 .

It is not a de Polignac number, because 285648560521 - 2¹⁵ = 285648527753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285648561521) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 105287461 + ... + 105290173.

Almost surely, 2^285648560521 is an apocalyptic number.

285648560521 is the 534461-st square number.

285648560521 is the 267231-st centered octagonal number.

It is an amenable number.

285648560521 is a deficient number, since it is larger than the sum of its proper divisors (1563218060).

285648560521 is an frugal number, since it uses more digits than its factorization.

285648560521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5820 (or 2910 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 52.

The spelling of 285648560521 in words is "two hundred eighty-five billion, six hundred forty-eight million, five hundred sixty thousand, five hundred twenty-one".