256416205 has 4 divisors (see below), whose sum is σ = 307699452. Its totient is φ = 205132960.

The previous prime is 256416197. The next prime is 256416211. The reversal of 256416205 is 502614652.

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 92217609 + 164198596 = 9603^2 + 12814^2 .

It is not a de Polignac number, because 256416205 - 2³ = 256416197 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25641616 + ... + 25641625.

It is an arithmetic number, because the mean of its divisors is an integer number (76924863).

Almost surely, 2^256416205 is an apocalyptic number.

It is an amenable number.

256416205 is a deficient number, since it is larger than the sum of its proper divisors (51283247).

256416205 is an equidigital number, since it uses as much as digits as its factorization.

256416205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51283246.

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 256416205 is about 16013.0011240866. The cubic root of 256416205 is about 635.3043408555.

It can be divided in two parts, 2564 and 16205, that added together give a square (18769 = 137²).

The spelling of 256416205 in words is "two hundred fifty-six million, four hundred sixteen thousand, two hundred five".