256517273557366 has 16 divisors (see below), whose sum is σ = 384986649235968. Its totient is φ = 128188399919400.

The previous prime is 256517273557339. The next prime is 256517273557367. The reversal of 256517273557366 is 663755372715652.

256517273557366 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×256517273557366² (a number of 30 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256517273557295 and 256517273557304.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256517273557367) 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, 52162531 + ... + 56867953.

It is an arithmetic number, because the mean of its divisors is an integer number (24061665577248).

Almost surely, 2^{256517273557366} is an apocalyptic number.

256517273557366 is a deficient number, since it is larger than the sum of its proper divisors (128469375678602).

256517273557366 is a wasteful number, since it uses less digits than its factorization.

256517273557366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4720347.

The product of its digits is 1666980000, while the sum is 70.

The spelling of 256517273557366 in words is "two hundred fifty-six trillion, five hundred seventeen billion, two hundred seventy-three million, five hundred fifty-seven thousand, three hundred sixty-six".