256220545306 has 16 divisors (see below), whose sum is σ = 419319540288. Its totient is φ = 116450118400.

The previous prime is 256220545279. The next prime is 256220545327. The reversal of 256220545306 is 603545022652.

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, 496750 + ... + 871321.

It is an arithmetic number, because the mean of its divisors is an integer number (26207471268).

Almost surely, 2^256220545306 is an apocalyptic number.

256220545306 is a deficient number, since it is larger than the sum of its proper divisors (163098994982).

256220545306 is a wasteful number, since it uses less digits than its factorization.

256220545306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1376597.

The product of its (nonzero) digits is 432000, while the sum is 40.

Adding to 256220545306 its reverse (603545022652), we get a palindrome (859765567958).

The spelling of 256220545306 in words is "two hundred fifty-six billion, two hundred twenty million, five hundred forty-five thousand, three hundred six".