256565606 has 16 divisors (see below), whose sum is σ = 429599808. Its totient is φ = 113908200.

The previous prime is 256565591. The next prime is 256565609. The reversal of 256565606 is 606565652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256565609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134660 + ... + 136551.

It is an arithmetic number, because the mean of its divisors is an integer number (26849988).

Almost surely, 2^256565606 is an apocalyptic number.

256565606 is a deficient number, since it is larger than the sum of its proper divisors (173034202).

256565606 is a wasteful number, since it uses less digits than its factorization.

256565606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271267.

The product of its (nonzero) digits is 324000, while the sum is 41.

The square root of 256565606 is about 16017.6654353873. The cubic root of 256565606 is about 635.4277036719.

The spelling of 256565606 in words is "two hundred fifty-six million, five hundred sixty-five thousand, six hundred six".