256343752242 has 30 divisors (see below), whose sum is σ = 574414329423. Its totient is φ = 85445769348.

The previous prime is 256343752219. The next prime is 256343752243. The reversal of 256343752242 is 242257343652.

256343752242 is a `hidden beast` number, since 2 + 5 + 6 + 34 + 375 + 2 + 242 = 666.

It can be written as a sum of positive squares in only one way, i.e., 128171876121 + 128171876121 = 358011^2 + 358011^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=358011.

It is not an unprimeable number, because it can be changed into a prime (256343752243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 6424309 + ... + 6464087.

Almost surely, 2^256343752242 is an apocalyptic number.

256343752242 is an abundant number, since it is smaller than the sum of its proper divisors (318070577181).

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

256343752242 is an frugal number, since it uses more digits than its factorization.

256343752242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79572 (or 39784 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 45.

The spelling of 256343752242 in words is "two hundred fifty-six billion, three hundred forty-three million, seven hundred fifty-two thousand, two hundred forty-two".