256111123331 has 12 divisors (see below), whose sum is σ = 298381462272. Its totient is φ = 219187615248.

The previous prime is 256111123277. The next prime is 256111123337. The reversal of 256111123331 is 133321111652.

It is not a de Polignac number, because 256111123331 - 2¹⁸ = 256110861187 is a prime.

It is a super-2 number, since 2×256111123331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 256111123294 and 256111123303.

It is not an unprimeable number, because it can be changed into a prime (256111123337) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3970115 + ... + 4034108.

It is an arithmetic number, because the mean of its divisors is an integer number (24865121856).

Almost surely, 2^256111123331 is an apocalyptic number.

256111123331 is a deficient number, since it is larger than the sum of its proper divisors (42270338941).

256111123331 is an equidigital number, since it uses as much as digits as its factorization.

256111123331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8004890 (or 8004883 counting only the distinct ones).

The product of its digits is 3240, while the sum is 29.

Adding to 256111123331 its reverse (133321111652), we get a palindrome (389432234983).

The spelling of 256111123331 in words is "two hundred fifty-six billion, one hundred eleven million, one hundred twenty-three thousand, three hundred thirty-one".