256828801815 has 32 divisors (see below), whose sum is σ = 460625135040. Its totient is φ = 135763181568.

The previous prime is 256828801811. The next prime is 256828801841. The reversal of 256828801815 is 518108828652.

It is not a de Polignac number, because 256828801815 - 2² = 256828801811 is a prime.

It is a super-2 number, since 2×256828801815² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256828801811) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8402602 + ... + 8433111.

It is an arithmetic number, because the mean of its divisors is an integer number (14394535470).

Almost surely, 2^256828801815 is an apocalyptic number.

256828801815 is a deficient number, since it is larger than the sum of its proper divisors (203796333225).

256828801815 is a wasteful number, since it uses less digits than its factorization.

256828801815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16835840 (or 16835834 counting only the distinct ones).

The product of its (nonzero) digits is 2457600, while the sum is 54.

The spelling of 256828801815 in words is "two hundred fifty-six billion, eight hundred twenty-eight million, eight hundred one thousand, eight hundred fifteen".