561001005556 has 12 divisors (see below), whose sum is σ = 997846051300. Its totient is φ = 275902133760.

The previous prime is 561001005527. The next prime is 561001005557. The reversal of 561001005556 is 655500100165.

It can be written as a sum of positive squares in 2 ways, for example, as 29973996900 + 531027008656 = 173130^2 + 728716^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561001005557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1149591981 + ... + 1149592468.

Almost surely, 2^561001005556 is an apocalyptic number.

It is an amenable number.

561001005556 is a deficient number, since it is larger than the sum of its proper divisors (436845045744).

561001005556 is a wasteful number, since it uses less digits than its factorization.

561001005556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2299184514 (or 2299184512 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 561001005556 in words is "five hundred sixty-one billion, one million, five thousand, five hundred fifty-six".