256828580251 has 8 divisors (see below), whose sum is σ = 258135983600. Its totient is φ = 255524492160.

The previous prime is 256828580249. The next prime is 256828580311. The reversal of 256828580251 is 152085828652.

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 256828580251 - 2¹ = 256828580249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256828580201) 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, 673410 + ... + 983431.

It is an arithmetic number, because the mean of its divisors is an integer number (32266997950).

Almost surely, 2^256828580251 is an apocalyptic number.

256828580251 is a deficient number, since it is larger than the sum of its proper divisors (1307403349).

256828580251 is a wasteful number, since it uses less digits than its factorization.

256828580251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1657629.

The product of its (nonzero) digits is 3072000, while the sum is 52.

The spelling of 256828580251 in words is "two hundred fifty-six billion, eight hundred twenty-eight million, five hundred eighty thousand, two hundred fifty-one".