256115663 has 8 divisors (see below), whose sum is σ = 261977328. Its totient is φ = 250292224.

The previous prime is 256115633. The next prime is 256115669. The reversal of 256115663 is 366511652.

256115663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 256115663 - 2⁸ = 256115407 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 (256115669) 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, 4220 + ... + 23022.

It is an arithmetic number, because the mean of its divisors is an integer number (32747166).

Almost surely, 2^256115663 is an apocalyptic number.

256115663 is a deficient number, since it is larger than the sum of its proper divisors (5861665).

256115663 is a wasteful number, since it uses less digits than its factorization.

256115663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19113.

The product of its digits is 32400, while the sum is 35.

The square root of 256115663 is about 16003.6140605802. The cubic root of 256115663 is about 635.0560332475.

The spelling of 256115663 in words is "two hundred fifty-six million, one hundred fifteen thousand, six hundred sixty-three".