256442553 has 12 divisors (see below), whose sum is σ = 374580180. Its totient is φ = 169040256.

The previous prime is 256442551. The next prime is 256442561. The reversal of 256442553 is 355244652.

256442553 is a `hidden beast` number, since 2 + 5 + 64 + 42 + 553 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 28643904 + 227798649 = 5352^2 + 15093^2 .

It is not a de Polignac number, because 256442553 - 2¹ = 256442551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (256442551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 159276 + ... + 160877.

It is an arithmetic number, because the mean of its divisors is an integer number (31215015).

Almost surely, 2^256442553 is an apocalyptic number.

It is an amenable number.

256442553 is a deficient number, since it is larger than the sum of its proper divisors (118137627).

256442553 is a wasteful number, since it uses less digits than its factorization.

256442553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320248 (or 320245 counting only the distinct ones).

The product of its digits is 144000, while the sum is 36.

The square root of 256442553 is about 16013.8238094466. The cubic root of 256442553 is about 635.3261003038.

The spelling of 256442553 in words is "two hundred fifty-six million, four hundred forty-two thousand, five hundred fifty-three".