256544120005 has 16 divisors (see below), whose sum is σ = 316469303280. Its totient is φ = 199501443072.

The previous prime is 256544120003. The next prime is 256544120023. The reversal of 256544120005 is 500021445652.

It can be written as a sum of positive squares in 8 ways, for example, as 2268997956 + 254275122049 = 47634^2 + 504257^2 .

It is a cyclic number.

It is not a de Polignac number, because 256544120005 - 2¹ = 256544120003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256544120003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450844 + ... + 846373.

It is an arithmetic number, because the mean of its divisors is an integer number (19779331455).

Almost surely, 2^256544120005 is an apocalyptic number.

It is an amenable number.

256544120005 is a deficient number, since it is larger than the sum of its proper divisors (59925183275).

256544120005 is a wasteful number, since it uses less digits than its factorization.

256544120005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1298328.

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 256544120005 its reverse (500021445652), we get a palindrome (756565565657).

The spelling of 256544120005 in words is "two hundred fifty-six billion, five hundred forty-four million, one hundred twenty thousand, five".