561681298116 has 27 divisors (see below), whose sum is σ = 1419816870381. Its totient is φ = 187225600464.

The previous prime is 561681298097. The next prime is 561681298127. The reversal of 561681298116 is 611892186165.

The square root of 561681298116 is 749454.

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

561681298116 is a `hidden beast` number, since 5 + 616 + 8 + 1 + 2 + 9 + 8 + 1 + 16 = 666.

It can be written as a sum of positive squares in only one way, i.e., 24978538116 + 536702760000 = 158046^2 + 732600^2 .

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, 4434270 + ... + 4559178.

Almost surely, 2^561681298116 is an apocalyptic number.

561681298116 is the 749454-th square number.

It is an amenable number.

561681298116 is an abundant number, since it is smaller than the sum of its proper divisors (858135572265).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561681298116 is an frugal number, since it uses more digits than its factorization.

561681298116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249828 (or 124914 counting only the distinct ones).

The product of its digits is 1244160, while the sum is 54.

The spelling of 561681298116 in words is "five hundred sixty-one billion, six hundred eighty-one million, two hundred ninety-eight thousand, one hundred sixteen".