256733454576705 has 8 divisors (see below), whose sum is σ = 410773527322752. Its totient is φ = 136924509107568.

The previous prime is 256733454576689. The next prime is 256733454576727. The reversal of 256733454576705 is 507675454337652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256733454576705 - 2⁴ = 256733454576689 is a prime.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 256733454576705.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8557781819209 + ... + 8557781819238.

It is an arithmetic number, because the mean of its divisors is an integer number (51346690915344).

Almost surely, 2^{256733454576705} is an apocalyptic number.

It is an amenable number.

256733454576705 is a deficient number, since it is larger than the sum of its proper divisors (154040072746047).

256733454576705 is a wasteful number, since it uses less digits than its factorization.

256733454576705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17115563638455.

The product of its (nonzero) digits is 2222640000, while the sum is 69.

The spelling of 256733454576705 in words is "two hundred fifty-six trillion, seven hundred thirty-three billion, four hundred fifty-four million, five hundred seventy-six thousand, seven hundred five".