556164809 has 4 divisors (see below), whose sum is σ = 588880404. Its totient is φ = 523449216.

The previous prime is 556164803. The next prime is 556164853. The reversal of 556164809 is 908461655.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 908461655 = 5 ⋅181692331.

It can be written as a sum of positive squares in 2 ways, for example, as 446899600 + 109265209 = 21140^2 + 10453^2 .

It is a cyclic number.

It is not a de Polignac number, because 556164809 - 2²⁴ = 539387593 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 556164809.

It is not an unprimeable number, because it can be changed into a prime (556164803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16357772 + ... + 16357805.

It is an arithmetic number, because the mean of its divisors is an integer number (147220101).

Almost surely, 2^556164809 is an apocalyptic number.

It is an amenable number.

556164809 is a deficient number, since it is larger than the sum of its proper divisors (32715595).

556164809 is a wasteful number, since it uses less digits than its factorization.

556164809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32715594.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 556164809 is about 23583.1467153983. The cubic root of 556164809 is about 822.3710912987.

The spelling of 556164809 in words is "five hundred fifty-six million, one hundred sixty-four thousand, eight hundred nine".