256321663111 has 4 divisors (see below), whose sum is σ = 256324267224. Its totient is φ = 256319059000.

The previous prime is 256321663109. The next prime is 256321663141. The reversal of 256321663111 is 111366123652.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256321663111 - 2¹ = 256321663109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256321663141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1148365 + ... + 1353286.

It is an arithmetic number, because the mean of its divisors is an integer number (64081066806).

Almost surely, 2^256321663111 is an apocalyptic number.

256321663111 is a deficient number, since it is larger than the sum of its proper divisors (2604113).

256321663111 is a wasteful number, since it uses less digits than its factorization.

256321663111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604112.

The product of its digits is 38880, while the sum is 37.

Adding to 256321663111 its reverse (111366123652), we get a palindrome (367687786763).

The spelling of 256321663111 in words is "two hundred fifty-six billion, three hundred twenty-one million, six hundred sixty-three thousand, one hundred eleven".