256760161 has 4 divisors (see below), whose sum is σ = 293440192. Its totient is φ = 220080132.

The previous prime is 256760137. The next prime is 256760213. The reversal of 256760161 is 161067652.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 256760161 - 2¹⁷ = 256629089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256760111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18340005 + ... + 18340018.

It is an arithmetic number, because the mean of its divisors is an integer number (73360048).

Almost surely, 2^256760161 is an apocalyptic number.

It is an amenable number.

256760161 is a deficient number, since it is larger than the sum of its proper divisors (36680031).

256760161 is an equidigital number, since it uses as much as digits as its factorization.

256760161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36680030.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 256760161 is about 16023.7374229610. The cubic root of 256760161 is about 635.5882791069.

The spelling of 256760161 in words is "two hundred fifty-six million, seven hundred sixty thousand, one hundred sixty-one".