561697786225 has 9 divisors (see below), whose sum is σ = 696509901633. Its totient is φ = 449355231120.

The previous prime is 561697786211. The next prime is 561697786229. The reversal of 561697786225 is 522687796165.

The square root of 561697786225 is 749465.

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 54446155569 + 507251630656 = 233337^2 + 712216^2 .

It is not a de Polignac number, because 561697786225 - 2¹¹ = 561697784177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561697786229) 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 8 ways as a sum of consecutive naturals, for example, 3672379 + ... + 3822271.

Almost surely, 2^561697786225 is an apocalyptic number.

561697786225 is the 749465-th square number.

561697786225 is the 374733-rd centered octagonal number.

It is an amenable number.

561697786225 is a deficient number, since it is larger than the sum of its proper divisors (134812115408).

561697786225 is an frugal number, since it uses more digits than its factorization.

561697786225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299796 (or 149898 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 64.

Multiplying 561697786225 by its sum of digits (64), we get a square (35948658318400 = 5995720²).

The spelling of 561697786225 in words is "five hundred sixty-one billion, six hundred ninety-seven million, seven hundred eighty-six thousand, two hundred twenty-five".