561661608 has 32 divisors (see below), whose sum is σ = 1404804960. Its totient is φ = 187133760.

The previous prime is 561661601. The next prime is 561661619. The reversal of 561661608 is 806166165.

It is a super-2 number, since 2×561661608² = 630927523802291328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (561661601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67366 + ... + 75242.

It is an arithmetic number, because the mean of its divisors is an integer number (43900155).

Almost surely, 2^561661608 is an apocalyptic number.

It is an amenable number.

561661608 is an abundant number, since it is smaller than the sum of its proper divisors (843143352).

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

561661608 is a wasteful number, since it uses less digits than its factorization.

561661608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10857 (or 10853 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 561661608 is about 23699.4010050887. The cubic root of 561661608 is about 825.0714883874.

The spelling of 561661608 in words is "five hundred sixty-one million, six hundred sixty-one thousand, six hundred eight".