256911433800848 has 40 divisors (see below), whose sum is σ = 509909397902520. Its totient is φ = 125321946946560.

The previous prime is 256911433800839. The next prime is 256911433800863. The reversal of 256911433800848 is 848008334119652.

It is a Cunningham number, because it is equal to 16028457²-1.

It can be written as a sum of positive squares in 4 ways, for example, as 21623690416384 + 235287743384464 = 4650128^2 + 15339092^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127225886 + ... + 129229442.

It is an arithmetic number, because the mean of its divisors is an integer number (12747734947563).

Almost surely, 2^{256911433800848} is an apocalyptic number.

It is an amenable number.

256911433800848 is a deficient number, since it is larger than the sum of its proper divisors (252997964101672).

256911433800848 is a wasteful number, since it uses less digits than its factorization.

256911433800848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2199075 (or 2199069 counting only the distinct ones).

The product of its (nonzero) digits is 39813120, while the sum is 62.

The spelling of 256911433800848 in words is "two hundred fifty-six trillion, nine hundred eleven billion, four hundred thirty-three million, eight hundred thousand, eight hundred forty-eight".