256115652605 has 16 divisors (see below), whose sum is σ = 315663945264. Its totient is φ = 199343070720.

The previous prime is 256115652599. The next prime is 256115652607. The reversal of 256115652605 is 506256511652.

It can be written as a sum of positive squares in 8 ways, for example, as 88505655001 + 167609997604 = 297499^2 + 409402^2 .

It is not a de Polignac number, because 256115652605 - 2¹⁰ = 256115651581 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 (256115652607) 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, 4362929 + ... + 4421241.

It is an arithmetic number, because the mean of its divisors is an integer number (19728996579).

Almost surely, 2^256115652605 is an apocalyptic number.

It is an amenable number.

256115652605 is a deficient number, since it is larger than the sum of its proper divisors (59548292659).

256115652605 is a wasteful number, since it uses less digits than its factorization.

256115652605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82096.

The product of its (nonzero) digits is 540000, while the sum is 44.

The spelling of 256115652605 in words is "two hundred fifty-six billion, one hundred fifteen million, six hundred fifty-two thousand, six hundred five".