256565656603 has 8 divisors (see below), whose sum is σ = 267350071680. Its totient is φ = 245910396480.

The previous prime is 256565656591. The next prime is 256565656621. The reversal of 256565656603 is 306656565652.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256565656603 - 2³⁷ = 119126703131 is a prime.

It is a super-2 number, since 2×256565656603² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256565656693) 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, 32284683 + ... + 32292628.

It is an arithmetic number, because the mean of its divisors is an integer number (33418758960).

Almost surely, 2^256565656603 is an apocalyptic number.

256565656603 is a deficient number, since it is larger than the sum of its proper divisors (10784415077).

256565656603 is a wasteful number, since it uses less digits than its factorization.

256565656603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64577477.

The product of its (nonzero) digits is 29160000, while the sum is 55.

The spelling of 256565656603 in words is "two hundred fifty-six billion, five hundred sixty-five million, six hundred fifty-six thousand, six hundred three".