561669306916 has 27 divisors (see below), whose sum is σ = 999461605233. Its totient is φ = 276185839920.

The previous prime is 561669306853. The next prime is 561669306923. The reversal of 561669306916 is 619603966165.

The square root of 561669306916 is 749446.

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., 18264441316 + 543404865600 = 135146^2 + 737160^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 91429341 + ... + 91435483.

Almost surely, 2^561669306916 is an apocalyptic number.

561669306916 is the 749446-th square number.

It is an amenable number.

561669306916 is a deficient number, since it is larger than the sum of its proper divisors (437792298317).

561669306916 is an frugal number, since it uses more digits than its factorization.

561669306916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12412 (or 6206 counting only the distinct ones).

The product of its (nonzero) digits is 9447840, while the sum is 58.

The spelling of 561669306916 in words is "five hundred sixty-one billion, six hundred sixty-nine million, three hundred six thousand, nine hundred sixteen".