561578766108858 has 48 divisors (see below), whose sum is σ = 1237048050069000. Its totient is φ = 184095637238400.

The previous prime is 561578766108839. The next prime is 561578766108889. The reversal of 561578766108858 is 858801667875165.

It can be written as a sum of positive squares in 4 ways, for example, as 479975493005649 + 81603273103209 = 21908343^2 + 9033453^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1036303653 + ... + 1036845416.

Almost surely, 2^{561578766108858} is an apocalyptic number.

561578766108858 is an abundant number, since it is smaller than the sum of its proper divisors (675469283960142).

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

561578766108858 is a wasteful number, since it uses less digits than its factorization.

561578766108858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073149327 (or 2073149324 counting only the distinct ones).

The product of its (nonzero) digits is 5419008000, while the sum is 81.

The spelling of 561578766108858 in words is "five hundred sixty-one trillion, five hundred seventy-eight billion, seven hundred sixty-six million, one hundred eight thousand, eight hundred fifty-eight".