561004126366 has 4 divisors (see below), whose sum is σ = 841506189552. Its totient is φ = 280502063182.

The previous prime is 561004126339. The next prime is 561004126421. The reversal of 561004126366 is 663621400165.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 140251031590 + ... + 140251031593.

It is an arithmetic number, because the mean of its divisors is an integer number (210376547388).

Almost surely, 2^561004126366 is an apocalyptic number.

561004126366 is a deficient number, since it is larger than the sum of its proper divisors (280502063186).

561004126366 is a wasteful number, since it uses less digits than its factorization.

561004126366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280502063185.

The product of its (nonzero) digits is 155520, while the sum is 40.

The spelling of 561004126366 in words is "five hundred sixty-one billion, four million, one hundred twenty-six thousand, three hundred sixty-six".