256705155621443 has 4 divisors (see below), whose sum is σ = 260320721193648. Its totient is φ = 253089590049240.

The previous prime is 256705155621437. The next prime is 256705155621463. The reversal of 256705155621443 is 344126551507652.

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

It is a cyclic number.

It is not a de Polignac number, because 256705155621443 - 2⁴ = 256705155621427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256705155621463) 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, 1807782785996 + ... + 1807782786137.

It is an arithmetic number, because the mean of its divisors is an integer number (65080180298412).

Almost surely, 2^{256705155621443} is an apocalyptic number.

256705155621443 is a deficient number, since it is larger than the sum of its proper divisors (3615565572205).

256705155621443 is an equidigital number, since it uses as much as digits as its factorization.

256705155621443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3615565572204.

The product of its (nonzero) digits is 30240000, while the sum is 56.

The spelling of 256705155621443 in words is "two hundred fifty-six trillion, seven hundred five billion, one hundred fifty-five million, six hundred twenty-one thousand, four hundred forty-three".