561533347908 has 240 divisors, whose sum is σ = 1673970144000. Its totient is φ = 163681891776.

The previous prime is 561533347883. The next prime is 561533347961. The reversal of 561533347908 is 809743335165.

561533347908 is a `hidden beast` number, since 5 + 6 + 1 + 533 + 34 + 79 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 13503973 + ... + 13545491.

It is an arithmetic number, because the mean of its divisors is an integer number (6974875600).

Almost surely, 2^561533347908 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 561533347908, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (836985072000).

561533347908 is an abundant number, since it is smaller than the sum of its proper divisors (1112436796092).

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

561533347908 is a wasteful number, since it uses less digits than its factorization.

561533347908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41593 (or 41556 counting only the distinct ones).

The product of its (nonzero) digits is 8164800, while the sum is 54.

The spelling of 561533347908 in words is "five hundred sixty-one billion, five hundred thirty-three million, three hundred forty-seven thousand, nine hundred eight".