256641261212 has 24 divisors (see below), whose sum is σ = 513301514880. Its totient is φ = 109985042160.

The previous prime is 256641261203. The next prime is 256641261223. The reversal of 256641261212 is 212162146652.

256641261212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 674339 + ... + 983877.

It is an arithmetic number, because the mean of its divisors is an integer number (21387563120).

Almost surely, 2^256641261212 is an apocalyptic number.

It is an amenable number.

256641261212 is an abundant number, since it is smaller than the sum of its proper divisors (256660253668).

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

256641261212 is a wasteful number, since it uses less digits than its factorization.

256641261212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339161 (or 339159 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The spelling of 256641261212 in words is "two hundred fifty-six billion, six hundred forty-one million, two hundred sixty-one thousand, two hundred twelve".