256828505263 has 8 divisors (see below), whose sum is σ = 280187256960. Its totient is φ = 233471537880.

The previous prime is 256828505251. The next prime is 256828505293. The reversal of 256828505263 is 362505828652.

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 256828505263 - 2¹³ = 256828497071 is a prime.

It is a super-2 number, since 2×256828505263² (a number of 24 digits) contains 22 as substring.

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 256828505263.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256828505293) 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, 135723 + ... + 729436.

It is an arithmetic number, because the mean of its divisors is an integer number (35023407120).

Almost surely, 2^256828505263 is an apocalyptic number.

256828505263 is a deficient number, since it is larger than the sum of its proper divisors (23358751697).

256828505263 is a wasteful number, since it uses less digits than its factorization.

256828505263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892157.

The product of its (nonzero) digits is 6912000, while the sum is 52.

The spelling of 256828505263 in words is "two hundred fifty-six billion, eight hundred twenty-eight million, five hundred five thousand, two hundred sixty-three".