256743536421349 has 16 divisors (see below), whose sum is σ = 267147704320000. Its totient is φ = 246472518055680.

The previous prime is 256743536421329. The next prime is 256743536421377. The reversal of 256743536421349 is 943124635347652.

It is a cyclic number.

It is not a de Polignac number, because 256743536421349 - 2⁷ = 256743536421221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256743536421329) 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 15 ways as a sum of consecutive naturals, for example, 25509277 + ... + 34120525.

It is an arithmetic number, because the mean of its divisors is an integer number (16696731520000).

Almost surely, 2^{256743536421349} is an apocalyptic number.

It is an amenable number.

256743536421349 is a deficient number, since it is larger than the sum of its proper divisors (10404167898651).

256743536421349 is a wasteful number, since it uses less digits than its factorization.

256743536421349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8618980.

The product of its digits is 391910400, while the sum is 64.

The spelling of 256743536421349 in words is "two hundred fifty-six trillion, seven hundred forty-three billion, five hundred thirty-six million, four hundred twenty-one thousand, three hundred forty-nine".