256605562 has 4 divisors (see below), whose sum is σ = 384908346. Its totient is φ = 128302780.

The previous prime is 256605533. The next prime is 256605563. The reversal of 256605562 is 265506652.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 244640881 + 11964681 = 15641^2 + 3459^2 .

It is not an unprimeable number, because it can be changed into a prime (256605563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64151389 + ... + 64151392.

Almost surely, 2^256605562 is an apocalyptic number.

256605562 is a deficient number, since it is larger than the sum of its proper divisors (128302784).

256605562 is a wasteful number, since it uses less digits than its factorization.

256605562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128302783.

The product of its (nonzero) digits is 108000, while the sum is 37.

The square root of 256605562 is about 16018.9126347577. The cubic root of 256605562 is about 635.4606878689.

The spelling of 256605562 in words is "two hundred fifty-six million, six hundred five thousand, five hundred sixty-two".