256616643362 has 4 divisors (see below), whose sum is σ = 384924965046. Its totient is φ = 128308321680.

The previous prime is 256616643331. The next prime is 256616643389. The reversal of 256616643362 is 263346616652.

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., 201916321201 + 54700322161 = 449351^2 + 233881^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 256616643362.

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 as a sum of consecutive naturals, namely, 64154160839 + ... + 64154160842.

Almost surely, 2^256616643362 is an apocalyptic number.

256616643362 is a deficient number, since it is larger than the sum of its proper divisors (128308321684).

256616643362 is a wasteful number, since it uses less digits than its factorization.

256616643362 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128308321683.

The product of its digits is 5598720, while the sum is 50.

The spelling of 256616643362 in words is "two hundred fifty-six billion, six hundred sixteen million, six hundred forty-three thousand, three hundred sixty-two".