561666406 has 32 divisors (see below), whose sum is σ = 983062080. Its totient is φ = 235699200.

The previous prime is 561666389. The next prime is 561666407. The reversal of 561666406 is 604666165.

561666406 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561666407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204450 + ... + 207178.

It is an arithmetic number, because the mean of its divisors is an integer number (30720690).

Almost surely, 2^561666406 is an apocalyptic number.

561666406 is a deficient number, since it is larger than the sum of its proper divisors (421395674).

561666406 is a wasteful number, since it uses less digits than its factorization.

561666406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3040.

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

The square root of 561666406 is about 23699.5022310596. The cubic root of 561666406 is about 825.0738377745.

The spelling of 561666406 in words is "five hundred sixty-one million, six hundred sixty-six thousand, four hundred six".