256473502565 has 8 divisors (see below), whose sum is σ = 351735089280. Its totient is φ = 175867544592.

The previous prime is 256473502561. The next prime is 256473502577. The reversal of 256473502565 is 565205374652.

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 256473502565 - 2² = 256473502561 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256473502561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3663907145 + ... + 3663907214.

It is an arithmetic number, because the mean of its divisors is an integer number (43966886160).

Almost surely, 2^256473502565 is an apocalyptic number.

It is an amenable number.

256473502565 is a deficient number, since it is larger than the sum of its proper divisors (95261586715).

256473502565 is an equidigital number, since it uses as much as digits as its factorization.

256473502565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7327814371.

The product of its (nonzero) digits is 7560000, while the sum is 50.

The spelling of 256473502565 in words is "two hundred fifty-six billion, four hundred seventy-three million, five hundred two thousand, five hundred sixty-five".