556666655 has 16 divisors (see below), whose sum is σ = 704371680. Its totient is φ = 421166592.

The previous prime is 556666639. The next prime is 556666657.

It is a happy number.

556666655 is nontrivially palindromic in base 10.

556666655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 556666655 - 2⁴ = 556666639 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556666657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53867 + ... + 63363.

It is an arithmetic number, because the mean of its divisors is an integer number (44023230).

Almost surely, 2^556666655 is an apocalyptic number.

556666655 is a deficient number, since it is larger than the sum of its proper divisors (147705025).

556666655 is a wasteful number, since it uses less digits than its factorization.

556666655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10138.

The product of its digits is 4860000, while the sum is 50.

The square root of 556666655 is about 23593.7842450083. The cubic root of 556666655 is about 822.6183678650.

The spelling of 556666655 in words is "five hundred fifty-six million, six hundred sixty-six thousand, six hundred fifty-five".