256563610 has 16 divisors (see below), whose sum is σ = 468142056. Its totient is φ = 101219328.

The previous prime is 256563589. The next prime is 256563611. The reversal of 256563610 is 16365652.

It can be written as a sum of positive squares in 4 ways, for example, as 147841281 + 108722329 = 12159^2 + 10427^2 .

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (256563611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174999 + ... + 176458.

Almost surely, 2^256563610 is an apocalyptic number.

256563610 is a deficient number, since it is larger than the sum of its proper divisors (211578446).

256563610 is a wasteful number, since it uses less digits than its factorization.

256563610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351537.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 256563610 is about 16017.6031290577. The cubic root of 256563610 is about 635.4260558582.

The spelling of 256563610 in words is "two hundred fifty-six million, five hundred sixty-three thousand, six hundred ten".