56166209 has 16 divisors (see below), whose sum is σ = 62674560. Its totient is φ = 49906560.

The previous prime is 56166199. The next prime is 56166211. The reversal of 56166209 is 90266165.

It is a happy number.

It is not a de Polignac number, because 56166209 - 2⁴ = 56166193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56166239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100559 + ... + 101115.

It is an arithmetic number, because the mean of its divisors is an integer number (3917160).

Almost surely, 2^56166209 is an apocalyptic number.

It is an amenable number.

56166209 is a deficient number, since it is larger than the sum of its proper divisors (6508351).

56166209 is a wasteful number, since it uses less digits than its factorization.

56166209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 56166209 is about 7494.4118515064. The cubic root of 56166209 is about 382.9643702923.

The spelling of 56166209 in words is "fifty-six million, one hundred sixty-six thousand, two hundred nine".