256378106985 has 96 divisors (see below), whose sum is σ = 560600030592. Its totient is φ = 98350801920.

The previous prime is 256378106977. The next prime is 256378106987. The reversal of 256378106985 is 589601873652.

It is not a de Polignac number, because 256378106985 - 2³ = 256378106977 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (256378106987) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1114524 + ... + 1324733.

It is an arithmetic number, because the mean of its divisors is an integer number (5839583652).

Almost surely, 2^256378106985 is an apocalyptic number.

It is an amenable number.

256378106985 is an abundant number, since it is smaller than the sum of its proper divisors (304221923607).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256378106985 is a wasteful number, since it uses less digits than its factorization.

256378106985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2439303 (or 2439296 counting only the distinct ones).

The product of its (nonzero) digits is 21772800, while the sum is 60.

It can be divided in two parts, 256378 and 106985, that added together give a palindrome (363363).

The spelling of 256378106985 in words is "two hundred fifty-six billion, three hundred seventy-eight million, one hundred six thousand, nine hundred eighty-five".