256573116461 has 16 divisors (see below), whose sum is σ = 266743157184. Its totient is φ = 246574750464.

The previous prime is 256573116413. The next prime is 256573116463. The reversal of 256573116461 is 164611375652.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 256573116461 - 2³⁴ = 239393247277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256573116463) 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, 20978030 + ... + 20990256.

It is an arithmetic number, because the mean of its divisors is an integer number (16671447324).

Almost surely, 2^256573116461 is an apocalyptic number.

It is an amenable number.

256573116461 is a deficient number, since it is larger than the sum of its proper divisors (10170040723).

256573116461 is a wasteful number, since it uses less digits than its factorization.

256573116461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19180.

The product of its digits is 907200, while the sum is 47.

The spelling of 256573116461 in words is "two hundred fifty-six billion, five hundred seventy-three million, one hundred sixteen thousand, four hundred sixty-one".