256021162305 has 16 divisors (see below), whose sum is σ = 410942601600. Its totient is φ = 136108372608.

The previous prime is 256021162291. The next prime is 256021162337. The reversal of 256021162305 is 503261120652.

It is not a de Polignac number, because 256021162305 - 2²⁰ = 256020113729 is a prime.

It is a Curzon 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, 27260605 + ... + 27269994.

It is an arithmetic number, because the mean of its divisors is an integer number (25683912600).

Almost surely, 2^256021162305 is an apocalyptic number.

It is an amenable number.

256021162305 is a deficient number, since it is larger than the sum of its proper divisors (154921439295).

256021162305 is a wasteful number, since it uses less digits than its factorization.

256021162305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54530920.

The product of its (nonzero) digits is 21600, while the sum is 33.

Adding to 256021162305 its reverse (503261120652), we get a palindrome (759282282957).

The spelling of 256021162305 in words is "two hundred fifty-six billion, twenty-one million, one hundred sixty-two thousand, three hundred five".