256281865610 has 64 divisors (see below), whose sum is σ = 476398933920. Its totient is φ = 99203051520.

The previous prime is 256281865583. The next prime is 256281865627. The reversal of 256281865610 is 16568182652.

It can be written as a sum of positive squares in 16 ways, for example, as 80989760569 + 175292105041 = 284587^2 + 418679^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25692584 + ... + 25702556.

Almost surely, 2^256281865610 is an apocalyptic number.

256281865610 is a deficient number, since it is larger than the sum of its proper divisors (220117068310).

256281865610 is a wasteful number, since it uses less digits than its factorization.

256281865610 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10523.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 256281865610 in words is "two hundred fifty-six billion, two hundred eighty-one million, eight hundred sixty-five thousand, six hundred ten".