561581284778 has 8 divisors (see below), whose sum is σ = 860294734272. Its totient is φ = 274816373356.

The previous prime is 561581284753. The next prime is 561581284783. The reversal of 561581284778 is 877482185165.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 561581284778.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2987134400 + ... + 2987134587.

It is an arithmetic number, because the mean of its divisors is an integer number (107536841784).

Almost surely, 2^561581284778 is an apocalyptic number.

561581284778 is a deficient number, since it is larger than the sum of its proper divisors (298713449494).

561581284778 is a wasteful number, since it uses less digits than its factorization.

561581284778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5974269036.

The product of its digits is 30105600, while the sum is 62.

The spelling of 561581284778 in words is "five hundred sixty-one billion, five hundred eighty-one million, two hundred eighty-four thousand, seven hundred seventy-eight".