561697869312 has 720 divisors, whose sum is σ = 1825653525696. Its totient is φ = 165504614400.

The previous prime is 561697869311. The next prime is 561697869323. The reversal of 561697869312 is 213968796165.

561697869312 is a `hidden beast` number, since 5 + 616 + 9 + 7 + 8 + 6 + 9 + 3 + 1 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 561697869312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561697869311) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 9208161762 + ... + 9208161822.

Almost surely, 2^561697869312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 561697869312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (912826762848).

561697869312 is an abundant number, since it is smaller than the sum of its proper divisors (1263955656384).

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

561697869312 is a wasteful number, since it uses less digits than its factorization.

561697869312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 171 counting only the distinct ones).

The product of its digits is 29393280, while the sum is 63.

The spelling of 561697869312 in words is "five hundred sixty-one billion, six hundred ninety-seven million, eight hundred sixty-nine thousand, three hundred twelve".