256166324345 has 8 divisors (see below), whose sum is σ = 309643382664. Its totient is φ = 203437197184.

The previous prime is 256166324333. The next prime is 256166324347. The reversal of 256166324345 is 543423661652.

It can be written as a sum of positive squares in 4 ways, for example, as 321556624 + 255844767721 = 17932^2 + 505811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-256166324345 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 256166324345.

It is not an unprimeable number, because it can be changed into a prime (256166324347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186982034 + ... + 186983403.

It is an arithmetic number, because the mean of its divisors is an integer number (38705422833).

Almost surely, 2^256166324345 is an apocalyptic number.

It is an amenable number.

256166324345 is a deficient number, since it is larger than the sum of its proper divisors (53477058319).

256166324345 is a wasteful number, since it uses less digits than its factorization.

256166324345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373965579.

The product of its digits is 3110400, while the sum is 47.

Adding to 256166324345 its reverse (543423661652), we get a palindrome (799589985997).

The spelling of 256166324345 in words is "two hundred fifty-six billion, one hundred sixty-six million, three hundred twenty-four thousand, three hundred forty-five".