561116808 has 160 divisors (see below), whose sum is σ = 1815116160. Its totient is φ = 158630400.

The previous prime is 561116789. The next prime is 561116867. The reversal of 561116808 is 808611165.

561116808 is a `hidden beast` number, since 561 + 1 + 16 + 80 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 466608 + ... + 467808.

It is an arithmetic number, because the mean of its divisors is an integer number (11344476).

Almost surely, 2^561116808 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 561116808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (907558080).

561116808 is an abundant number, since it is smaller than the sum of its proper divisors (1253999352).

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

561116808 is a wasteful number, since it uses less digits than its factorization.

561116808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329 (or 1316 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 561116808 is about 23687.9042551257. The cubic root of 561116808 is about 824.8046347316.

The spelling of 561116808 in words is "five hundred sixty-one million, one hundred sixteen thousand, eight hundred eight".