256703702561 has 4 divisors (see below), whose sum is σ = 256714599300. Its totient is φ = 256692805824.

The previous prime is 256703702551. The next prime is 256703702579. The reversal of 256703702561 is 165207307652.

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 29556142561 + 227147560000 = 171919^2 + 476600^2 .

It is a cyclic number.

It is not a de Polignac number, because 256703702561 - 2¹⁰ = 256703701537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256703702551) 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, 5412956 + ... + 5460173.

It is an arithmetic number, because the mean of its divisors is an integer number (64178649825).

Almost surely, 2^256703702561 is an apocalyptic number.

It is an amenable number.

256703702561 is a deficient number, since it is larger than the sum of its proper divisors (10896739).

256703702561 is a wasteful number, since it uses less digits than its factorization.

256703702561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10896738.

The product of its (nonzero) digits is 529200, while the sum is 44.

The spelling of 256703702561 in words is "two hundred fifty-six billion, seven hundred three million, seven hundred two thousand, five hundred sixty-one".