256637776345345 has 16 divisors (see below), whose sum is σ = 309579601093632. Its totient is φ = 204234054519040.

The previous prime is 256637776345319. The next prime is 256637776345369. The reversal of 256637776345345 is 543543677736652.

256637776345345 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 256637776345345 - 2¹³ = 256637776337153 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176066649 + ... + 177518281.

It is an arithmetic number, because the mean of its divisors is an integer number (19348725068352).

Almost surely, 2^{256637776345345} is an apocalyptic number.

It is an amenable number.

256637776345345 is a deficient number, since it is larger than the sum of its proper divisors (52941824748287).

256637776345345 is a wasteful number, since it uses less digits than its factorization.

256637776345345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1636952.

The product of its digits is 8001504000, while the sum is 73.

The spelling of 256637776345345 in words is "two hundred fifty-six trillion, six hundred thirty-seven billion, seven hundred seventy-six million, three hundred forty-five thousand, three hundred forty-five".