256530405231336 has 64 divisors (see below), whose sum is σ = 651304936800000. Its totient is φ = 84185814825216.

The previous prime is 256530405231323. The next prime is 256530405231341. The reversal of 256530405231336 is 633132504035652.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 193179051 + ... + 194502458.

It is an arithmetic number, because the mean of its divisors is an integer number (10176639637500).

Almost surely, 2^{256530405231336} is an apocalyptic number.

It is an amenable number.

256530405231336 is an abundant number, since it is smaller than the sum of its proper divisors (394774531568664).

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

256530405231336 is a wasteful number, since it uses less digits than its factorization.

256530405231336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387681946 (or 387681942 counting only the distinct ones).

The product of its (nonzero) digits is 5832000, while the sum is 48.

Adding to 256530405231336 its reverse (633132504035652), we get a palindrome (889662909266988).

The spelling of 256530405231336 in words is "two hundred fifty-six trillion, five hundred thirty billion, four hundred five million, two hundred thirty-one thousand, three hundred thirty-six".