256421361156 has 12 divisors (see below), whose sum is σ = 598316509392. Its totient is φ = 85473787048.

The previous prime is 256421361137. The next prime is 256421361193. The reversal of 256421361156 is 651163124652.

256421361156 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10684223370 + ... + 10684223393.

It is an arithmetic number, because the mean of its divisors is an integer number (49859709116).

Almost surely, 2^256421361156 is an apocalyptic number.

It is an amenable number.

256421361156 is an abundant number, since it is smaller than the sum of its proper divisors (341895148236).

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

256421361156 is a wasteful number, since it uses less digits than its factorization.

256421361156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21368446770 (or 21368446768 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The spelling of 256421361156 in words is "two hundred fifty-six billion, four hundred twenty-one million, three hundred sixty-one thousand, one hundred fifty-six".