561391041078 has 72 divisors (see below), whose sum is σ = 1415047893480. Its totient is φ = 160384593600.

The previous prime is 561391041049. The next prime is 561391041083. The reversal of 561391041078 is 870140193165.

561391041078 is a `hidden beast` number, since 5 + 613 + 9 + 10 + 4 + 10 + 7 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 19258018 + ... + 19287146.

It is an arithmetic number, because the mean of its divisors is an integer number (19653442965).

Almost surely, 2^561391041078 is an apocalyptic number.

561391041078 is an abundant number, since it is smaller than the sum of its proper divisors (853656852402).

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

561391041078 is a wasteful number, since it uses less digits than its factorization.

561391041078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51002 (or 50992 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 561391041078 in words is "five hundred sixty-one billion, three hundred ninety-one million, forty-one thousand, seventy-eight".