561005557558 has 16 divisors (see below), whose sum is σ = 849443293440. Its totient is φ = 277858227816.

The previous prime is 561005557481. The next prime is 561005557603. The reversal of 561005557558 is 855755500165.

561005557558 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×561005557558² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2641903 + ... + 2846341.

It is an arithmetic number, because the mean of its divisors is an integer number (53090205840).

Almost surely, 2^561005557558 is an apocalyptic number.

561005557558 is a deficient number, since it is larger than the sum of its proper divisors (288437735882).

561005557558 is a wasteful number, since it uses less digits than its factorization.

561005557558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217371.

The product of its (nonzero) digits is 5250000, while the sum is 52.

The spelling of 561005557558 in words is "five hundred sixty-one billion, five million, five hundred fifty-seven thousand, five hundred fifty-eight".