256243631620246 has 32 divisors (see below), whose sum is σ = 389638145203200. Its totient is φ = 126367706949120.

The previous prime is 256243631620241. The next prime is 256243631620267. The reversal of 256243631620246 is 642026136342652.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 256243631620193 and 256243631620202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256243631620241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 643187766 + ... + 643586038.

It is an arithmetic number, because the mean of its divisors is an integer number (12176192037600).

Almost surely, 2^{256243631620246} is an apocalyptic number.

256243631620246 is a deficient number, since it is larger than the sum of its proper divisors (133394513582954).

256243631620246 is a wasteful number, since it uses less digits than its factorization.

256243631620246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402604.

The product of its (nonzero) digits is 14929920, while the sum is 52.

Adding to 256243631620246 its reverse (642026136342652), we get a palindrome (898269767962898).

The spelling of 256243631620246 in words is "two hundred fifty-six trillion, two hundred forty-three billion, six hundred thirty-one million, six hundred twenty thousand, two hundred forty-six".