256404444485 has 24 divisors (see below), whose sum is σ = 360062962560. Its totient is φ = 174767347104.

The previous prime is 256404444481. The next prime is 256404444509. The reversal of 256404444485 is 584444404652.

It is not a de Polignac number, because 256404444485 - 2² = 256404444481 is a prime.

It is a super-2 number, since 2×256404444485² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256404444481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3092465 + ... + 3174294.

It is an arithmetic number, because the mean of its divisors is an integer number (15002623440).

Almost surely, 2^256404444485 is an apocalyptic number.

It is an amenable number.

256404444485 is a deficient number, since it is larger than the sum of its proper divisors (103658518075).

256404444485 is a wasteful number, since it uses less digits than its factorization.

256404444485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6266945 (or 6266938 counting only the distinct ones).

The product of its (nonzero) digits is 9830400, while the sum is 50.

The spelling of 256404444485 in words is "two hundred fifty-six billion, four hundred four million, four hundred forty-four thousand, four hundred eighty-five".