256066401 has 16 divisors (see below), whose sum is σ = 359762240. Its totient is φ = 161559360.

The previous prime is 256066379. The next prime is 256066409. The reversal of 256066401 is 104660652.

It is not a de Polignac number, because 256066401 - 2²¹ = 253969249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256066409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77091 + ... + 80343.

It is an arithmetic number, because the mean of its divisors is an integer number (22485140).

Almost surely, 2^256066401 is an apocalyptic number.

It is an amenable number.

256066401 is a deficient number, since it is larger than the sum of its proper divisors (103695839).

256066401 is a wasteful number, since it uses less digits than its factorization.

256066401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 256066401 is about 16002.0748967126. The cubic root of 256066401 is about 635.0153144879.

The spelling of 256066401 in words is "two hundred fifty-six million, sixty-six thousand, four hundred one".