256663126335 has 128 divisors (see below), whose sum is σ = 521251780608. Its totient is φ = 104742144000.

The previous prime is 256663126333. The next prime is 256663126367. The reversal of 256663126335 is 533621366652.

It is a happy number.

It is not a de Polignac number, because 256663126335 - 2¹ = 256663126333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256663126333) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 47695345 + ... + 47700725.

It is an arithmetic number, because the mean of its divisors is an integer number (4072279536).

Almost surely, 2^256663126335 is an apocalyptic number.

256663126335 is an abundant number, since it is smaller than the sum of its proper divisors (264588654273).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256663126335 is a wasteful number, since it uses less digits than its factorization.

256663126335 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6145.

The product of its digits is 3499200, while the sum is 48.

The spelling of 256663126335 in words is "two hundred fifty-six billion, six hundred sixty-three million, one hundred twenty-six thousand, three hundred thirty-five".