568909656121 has 27 divisors (see below), whose sum is σ = 609549903183. Its totient is φ = 530939403120.

The previous prime is 568909656061. The next prime is 568909656127. The reversal of 568909656121 is 121656909865.

The square root of 568909656121 is 754261.

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

It can be written as a sum of positive squares in only one way, i.e., 298322423721 + 270587232400 = 546189^2 + 520180^2 .

It is not a de Polignac number, because 568909656121 - 2¹⁵ = 568909623353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (568909656127) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 678080220 + ... + 678081058.

Almost surely, 2^568909656121 is an apocalyptic number.

568909656121 is the 754261-st square number.

568909656121 is the 377131-st centered octagonal number.

It is an amenable number.

568909656121 is a deficient number, since it is larger than the sum of its proper divisors (40640247062).

568909656121 is an frugal number, since it uses more digits than its factorization.

568909656121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1798 (or 899 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 58.

The spelling of 568909656121 in words is "five hundred sixty-eight billion, nine hundred nine million, six hundred fifty-six thousand, one hundred twenty-one".