556265809 has 4 divisors (see below), whose sum is σ = 606835440. Its totient is φ = 505696180.

The previous prime is 556265779. The next prime is 556265813. The reversal of 556265809 is 908562655.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 556265809 - 2¹⁹ = 555741521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (556265839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25284799 + ... + 25284820.

It is an arithmetic number, because the mean of its divisors is an integer number (151708860).

Almost surely, 2^556265809 is an apocalyptic number.

It is an amenable number.

556265809 is a deficient number, since it is larger than the sum of its proper divisors (50569631).

556265809 is a wasteful number, since it uses less digits than its factorization.

556265809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50569630.

The product of its (nonzero) digits is 648000, while the sum is 46.

The square root of 556265809 is about 23585.2879778899. The cubic root of 556265809 is about 822.4208693809.

The spelling of 556265809 in words is "five hundred fifty-six million, two hundred sixty-five thousand, eight hundred nine".