256332642454617 has 16 divisors (see below), whose sum is σ = 343153580353920. Its totient is φ = 170201220434432.

The previous prime is 256332642454531. The next prime is 256332642454709. The reversal of 256332642454617 is 716454246233652.

It is a cyclic number.

It is not a de Polignac number, because 256332642454617 - 2²² = 256332638260313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256332642459617) 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, 143361558 + ... + 145138559.

It is an arithmetic number, because the mean of its divisors is an integer number (21447098772120).

Almost surely, 2^{256332642454617} is an apocalyptic number.

It is an amenable number.

256332642454617 is a deficient number, since it is larger than the sum of its proper divisors (86820937899303).

256332642454617 is a wasteful number, since it uses less digits than its factorization.

256332642454617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288501312.

The product of its digits is 174182400, while the sum is 60.

The spelling of 256332642454617 in words is "two hundred fifty-six trillion, three hundred thirty-two billion, six hundred forty-two million, four hundred fifty-four thousand, six hundred seventeen".