256605467329 has 4 divisors (see below), whose sum is σ = 256699430320. Its totient is φ = 256511504340.

The previous prime is 256605467303. The next prime is 256605467359. The reversal of 256605467329 is 923764506652.

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 a cyclic number.

It is not a de Polignac number, because 256605467329 - 2⁵ = 256605467297 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 256605467329.

It is not an unprimeable number, because it can be changed into a prime (256605467359) 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, 46977399 + ... + 46982860.

It is an arithmetic number, because the mean of its divisors is an integer number (64174857580).

Almost surely, 2^256605467329 is an apocalyptic number.

It is an amenable number.

256605467329 is a deficient number, since it is larger than the sum of its proper divisors (93962991).

256605467329 is an equidigital number, since it uses as much as digits as its factorization.

256605467329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93962990.

The product of its (nonzero) digits is 16329600, while the sum is 55.

The spelling of 256605467329 in words is "two hundred fifty-six billion, six hundred five million, four hundred sixty-seven thousand, three hundred twenty-nine".