561578766108856 has 64 divisors (see below), whose sum is σ = 1121330829312000. Its totient is φ = 262905245856000.

The previous prime is 561578766108839. The next prime is 561578766108889. The reversal of 561578766108856 is 658801667875165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21230665 + ... + 39672391.

It is an arithmetic number, because the mean of its divisors is an integer number (17520794208000).

Almost surely, 2^{561578766108856} is an apocalyptic number.

It is an amenable number.

561578766108856 is a deficient number, since it is larger than the sum of its proper divisors (559752063203144).

561578766108856 is a wasteful number, since it uses less digits than its factorization.

561578766108856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18444092 (or 18444088 counting only the distinct ones).

The product of its (nonzero) digits is 4064256000, while the sum is 79.

The spelling of 561578766108856 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-six".