561555600 has 60 divisors (see below), whose sum is σ = 1798853616. Its totient is φ = 149747840.

The previous prime is 561555593. The next prime is 561555613. The reversal of 561555600 is 6555165.

It is a tau number, because it is divible by the number of its divisors (60).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 232782 + ... + 235181.

Almost surely, 2^561555600 is an apocalyptic number.

561555600 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

561555600 is an abundant number, since it is smaller than the sum of its proper divisors (1237298016).

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

561555600 is a wasteful number, since it uses less digits than its factorization.

561555600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467984 (or 467973 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 561555600 is about 23697.1643873270. The cubic root of 561555600 is about 825.0195771296.

The spelling of 561555600 in words is "five hundred sixty-one million, five hundred fifty-five thousand, six hundred".