256606006205 has 8 divisors (see below), whose sum is σ = 316249564632. Its totient is φ = 199736566848.

The previous prime is 256606006199. The next prime is 256606006211. The reversal of 256606006205 is 502600606652.

It is an interprime number because it is at equal distance from previous prime (256606006199) and next prime (256606006211).

It can be written as a sum of positive squares in 4 ways, for example, as 158565629209 + 98040376996 = 398203^2 + 313114^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 256606006205 - 2⁶ = 256606006141 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 693529562 + ... + 693529931.

It is an arithmetic number, because the mean of its divisors is an integer number (39531195579).

Almost surely, 2^256606006205 is an apocalyptic number.

It is an amenable number.

256606006205 is a deficient number, since it is larger than the sum of its proper divisors (59643558427).

256606006205 is a wasteful number, since it uses less digits than its factorization.

256606006205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387059535.

The product of its (nonzero) digits is 129600, while the sum is 38.

The spelling of 256606006205 in words is "two hundred fifty-six billion, six hundred six million, six thousand, two hundred five".