256683315080501 has 4 divisors (see below), whose sum is σ = 260891238278604. Its totient is φ = 252475391882400.

The previous prime is 256683315080389. The next prime is 256683315080503. The reversal of 256683315080501 is 105080513386652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 85610125625476 + 171073189455025 = 9252574^2 + 13079495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256683315080501 is a prime.

It is a super-2 number, since 2×256683315080501² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256683315080503) 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, 2103961598960 + ... + 2103961599081.

It is an arithmetic number, because the mean of its divisors is an integer number (65222809569651).

Almost surely, 2^{256683315080501} is an apocalyptic number.

It is an amenable number.

256683315080501 is a deficient number, since it is larger than the sum of its proper divisors (4207923198103).

256683315080501 is an equidigital number, since it uses as much as digits as its factorization.

256683315080501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4207923198102.

The product of its (nonzero) digits is 5184000, while the sum is 53.

The spelling of 256683315080501 in words is "two hundred fifty-six trillion, six hundred eighty-three billion, three hundred fifteen million, eighty thousand, five hundred one".