561694078788 has 48 divisors (see below), whose sum is σ = 1460752413120. Its totient is φ = 166943130624.

The previous prime is 561694078763. The next prime is 561694078793. The reversal of 561694078788 is 887870496165.

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 15 ways as a sum of consecutive naturals, for example, 72454081 + ... + 72461832.

It is an arithmetic number, because the mean of its divisors is an integer number (30432341940).

Almost surely, 2^561694078788 is an apocalyptic number.

It is an amenable number.

561694078788 is an abundant number, since it is smaller than the sum of its proper divisors (899058334332).

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

561694078788 is a wasteful number, since it uses less digits than its factorization.

561694078788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144915956 (or 144915954 counting only the distinct ones).

The product of its (nonzero) digits is 162570240, while the sum is 69.

The spelling of 561694078788 in words is "five hundred sixty-one billion, six hundred ninety-four million, seventy-eight thousand, seven hundred eighty-eight".