256600173 has 4 divisors (see below), whose sum is σ = 342133568. Its totient is φ = 171066780.

The previous prime is 256600163. The next prime is 256600241. The reversal of 256600173 is 371006652.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 256600173 - 2¹⁰ = 256599149 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256600173.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256600153) 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, 42766693 + ... + 42766698.

It is an arithmetic number, because the mean of its divisors is an integer number (85533392).

Almost surely, 2^256600173 is an apocalyptic number.

It is an amenable number.

256600173 is a deficient number, since it is larger than the sum of its proper divisors (85533395).

256600173 is an equidigital number, since it uses as much as digits as its factorization.

256600173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85533394.

The product of its (nonzero) digits is 7560, while the sum is 30.

The square root of 256600173 is about 16018.7444264524. The cubic root of 256600173 is about 635.4562393791.

The spelling of 256600173 in words is "two hundred fifty-six million, six hundred thousand, one hundred seventy-three".