256666143255 has 8 divisors (see below), whose sum is σ = 410665829232. Its totient is φ = 136888609728.

The previous prime is 256666143221. The next prime is 256666143269. The reversal of 256666143255 is 552341666652.

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

It is not a de Polignac number, because 256666143255 - 2⁷ = 256666143127 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256666143198 and 256666143207.

It is a congruent number.

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, 8555538094 + ... + 8555538123.

It is an arithmetic number, because the mean of its divisors is an integer number (51333228654).

Almost surely, 2^256666143255 is an apocalyptic number.

256666143255 is a deficient number, since it is larger than the sum of its proper divisors (153999685977).

256666143255 is a wasteful number, since it uses less digits than its factorization.

256666143255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17111076225.

The product of its digits is 7776000, while the sum is 51.

The spelling of 256666143255 in words is "two hundred fifty-six billion, six hundred sixty-six million, one hundred forty-three thousand, two hundred fifty-five".