256626615340745 has 16 divisors (see below), whose sum is σ = 334683122909520. Its totient is φ = 187770271544064.

The previous prime is 256626615340741. The next prime is 256626615340801. The reversal of 256626615340745 is 547043516626652.

It can be written as a sum of positive squares in 8 ways, for example, as 40273581745609 + 216353033595136 = 6346147^2 + 14708944^2 .

It is a cyclic number.

It is not a de Polignac number, because 256626615340745 - 2² = 256626615340741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256626615340741) 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, 18110551514 + ... + 18110565683.

It is an arithmetic number, because the mean of its divisors is an integer number (20917695181845).

Almost surely, 2^{256626615340745} is an apocalyptic number.

It is an amenable number.

256626615340745 is a deficient number, since it is larger than the sum of its proper divisors (78056507568775).

256626615340745 is a wasteful number, since it uses less digits than its factorization.

256626615340745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36221117324.

The product of its (nonzero) digits is 217728000, while the sum is 62.

The spelling of 256626615340745 in words is "two hundred fifty-six trillion, six hundred twenty-six billion, six hundred fifteen million, three hundred forty thousand, seven hundred forty-five".