256754523773717 has 4 divisors (see below), whose sum is σ = 256977207663660. Its totient is φ = 256531839883776.

The previous prime is 256754523773681. The next prime is 256754523773723. The reversal of 256754523773717 is 717377325457652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 126446111770276 + 130308412003441 = 11244826^2 + 11415271^2 .

It is a cyclic number.

It is not a de Polignac number, because 256754523773717 - 2¹⁰ = 256754523772693 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 (256754523773117) 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, 111341943242 + ... + 111341945547.

It is an arithmetic number, because the mean of its divisors is an integer number (64244301915915).

Almost surely, 2^{256754523773717} is an apocalyptic number.

It is an amenable number.

256754523773717 is a deficient number, since it is larger than the sum of its proper divisors (222683889943).

256754523773717 is a wasteful number, since it uses less digits than its factorization.

256754523773717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222683889942.

The product of its digits is 1815156000, while the sum is 71.

The spelling of 256754523773717 in words is "two hundred fifty-six trillion, seven hundred fifty-four billion, five hundred twenty-three million, seven hundred seventy-three thousand, seven hundred seventeen".