561611110666 has 4 divisors (see below), whose sum is σ = 842416666002. Its totient is φ = 280805555332.

The previous prime is 561611110663. The next prime is 561611110681. The reversal of 561611110666 is 666011116165.

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

It can be written as a sum of positive squares in only one way, i.e., 288739649025 + 272871461641 = 537345^2 + 522371^2 .

It is not an unprimeable number, because it can be changed into a prime (561611110663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140402777665 + ... + 140402777668.

Almost surely, 2^561611110666 is an apocalyptic number.

561611110666 is a deficient number, since it is larger than the sum of its proper divisors (280805555336).

561611110666 is a wasteful number, since it uses less digits than its factorization.

561611110666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280805555335.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 561611110666 in words is "five hundred sixty-one billion, six hundred eleven million, one hundred ten thousand, six hundred sixty-six".