556662666778 has 8 divisors (see below), whose sum is σ = 834997649940. Its totient is φ = 278330116800.

The previous prime is 556662666773. The next prime is 556662666779. The reversal of 556662666778 is 877666266655.

It can be written as a sum of positive squares in 2 ways, for example, as 547175322369 + 9487344409 = 739713^2 + 97403^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (556662666773) 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 in 3 ways as a sum of consecutive naturals, for example, 155428 + ... + 1066528.

Almost surely, 2^556662666778 is an apocalyptic number.

556662666778 is a deficient number, since it is larger than the sum of its proper divisors (278334983162).

556662666778 is a wasteful number, since it uses less digits than its factorization.

556662666778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1216592.

The product of its digits is 914457600, while the sum is 70.

The spelling of 556662666778 in words is "five hundred fifty-six billion, six hundred sixty-two million, six hundred sixty-six thousand, seven hundred seventy-eight".