256753056251665 has 8 divisors (see below), whose sum is σ = 308103924826368. Its totient is φ = 205402273451760.

The previous prime is 256753056251663. The next prime is 256753056251683. The reversal of 256753056251665 is 566152650357652.

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

It is not a de Polignac number, because 256753056251665 - 2¹ = 256753056251663 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256753056251597 and 256753056251606.

It is not an unprimeable number, because it can be changed into a prime (256753056251663) 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, 14663457 + ... + 26991166.

It is an arithmetic number, because the mean of its divisors is an integer number (38512990603296).

Almost surely, 2^{256753056251665} is an apocalyptic number.

It is an amenable number.

256753056251665 is a deficient number, since it is larger than the sum of its proper divisors (51350868574703).

256753056251665 is a wasteful number, since it uses less digits than its factorization.

256753056251665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42887399.

The product of its (nonzero) digits is 340200000, while the sum is 64.

The spelling of 256753056251665 in words is "two hundred fifty-six trillion, seven hundred fifty-three billion, fifty-six million, two hundred fifty-one thousand, six hundred sixty-five".