256602082609 has 2 divisors, whose sum is σ = 256602082610. Its totient is φ = 256602082608.

The previous prime is 256602082603. The next prime is 256602082657. The reversal of 256602082609 is 906280206652.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252285198400 + 4316884209 = 502280^2 + 65703^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256602082609 is a prime.

It is not a weakly prime, because it can be changed into another prime (256602082603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128301041304 + 128301041305.

It is an arithmetic number, because the mean of its divisors is an integer number (128301041305).

Almost surely, 2^256602082609 is an apocalyptic number.

It is an amenable number.

256602082609 is a deficient number, since it is larger than the sum of its proper divisors (1).

256602082609 is an equidigital number, since it uses as much as digits as its factorization.

256602082609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 622080, while the sum is 46.

The spelling of 256602082609 in words is "two hundred fifty-six billion, six hundred two million, eighty-two thousand, six hundred nine".