256760065 has 4 divisors (see below), whose sum is σ = 308112084. Its totient is φ = 205408048.

The previous prime is 256760047. The next prime is 256760071. The reversal of 256760065 is 560067652.

256760065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64577296 + 192182769 = 8036^2 + 13863^2 .

It is a cyclic number.

It is not a de Polignac number, because 256760065 - 2²⁷ = 122542337 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25676002 + ... + 25676011.

It is an arithmetic number, because the mean of its divisors is an integer number (77028021).

Almost surely, 2^256760065 is an apocalyptic number.

It is an amenable number.

256760065 is a deficient number, since it is larger than the sum of its proper divisors (51352019).

256760065 is an equidigital number, since it uses as much as digits as its factorization.

256760065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51352018.

The product of its (nonzero) digits is 75600, while the sum is 37.

The square root of 256760065 is about 16023.7344274049. The cubic root of 256760065 is about 635.5881998936.

The spelling of 256760065 in words is "two hundred fifty-six million, seven hundred sixty thousand, sixty-five".