256321659 has 16 divisors (see below), whose sum is σ = 373469184. Its totient is φ = 155080800.

The previous prime is 256321651. The next prime is 256321717. The reversal of 256321659 is 956123652.

It is not a de Polignac number, because 256321659 - 2³ = 256321651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256321651) 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, 13894 + ... + 26564.

It is an arithmetic number, because the mean of its divisors is an integer number (23341824).

Almost surely, 2^256321659 is an apocalyptic number.

256321659 is a deficient number, since it is larger than the sum of its proper divisors (117147525).

256321659 is a wasteful number, since it uses less digits than its factorization.

256321659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13298.

The product of its digits is 97200, while the sum is 39.

The square root of 256321659 is about 16010.0486882458. The cubic root of 256321659 is about 635.2262479385.

The spelling of 256321659 in words is "two hundred fifty-six million, three hundred twenty-one thousand, six hundred fifty-nine".