256654311343 has 4 divisors (see below), whose sum is σ = 265504460040. Its totient is φ = 247804162648.

The previous prime is 256654311257. The next prime is 256654311359. The reversal of 256654311343 is 343113456652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256654311343 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256654311343.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256654311643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4425074305 + ... + 4425074362.

It is an arithmetic number, because the mean of its divisors is an integer number (66376115010).

Almost surely, 2^256654311343 is an apocalyptic number.

256654311343 is a deficient number, since it is larger than the sum of its proper divisors (8850148697).

256654311343 is an equidigital number, since it uses as much as digits as its factorization.

256654311343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8850148696.

The product of its digits is 777600, while the sum is 43.

Adding to 256654311343 its reverse (343113456652), we get a palindrome (599767767995).

The spelling of 256654311343 in words is "two hundred fifty-six billion, six hundred fifty-four million, three hundred eleven thousand, three hundred forty-three".