256565656602 has 20 divisors (see below), whose sum is σ = 574897119786. Its totient is φ = 85521885480.

The previous prime is 256565656591. The next prime is 256565656621. The reversal of 256565656602 is 206656565652.

256565656602 is a `hidden beast` number, since 25 + 6 + 5 + 6 + 5 + 6 + 5 + 6 + 602 = 666.

256565656602 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 154479655521 + 102086001081 = 393039^2 + 319509^2 .

It is a super-2 number, since 2×256565656602² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 791869149 + ... + 791869472.

Almost surely, 2^256565656602 is an apocalyptic number.

256565656602 is an abundant number, since it is smaller than the sum of its proper divisors (318331463184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256565656602 is a wasteful number, since it uses less digits than its factorization.

256565656602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583738635 (or 1583738626 counting only the distinct ones).

The product of its (nonzero) digits is 19440000, while the sum is 54.

The spelling of 256565656602 in words is "two hundred fifty-six billion, five hundred sixty-five million, six hundred fifty-six thousand, six hundred two".