556660660 has 24 divisors (see below), whose sum is σ = 1169794080. Its totient is φ = 222510624.

The previous prime is 556660639. The next prime is 556660669. The reversal of 556660660 is 66066655.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556660669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22767 + ... + 40393.

It is an arithmetic number, because the mean of its divisors is an integer number (48741420).

Almost surely, 2^556660660 is an apocalyptic number.

It is an amenable number.

556660660 is an abundant number, since it is smaller than the sum of its proper divisors (613133420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

556660660 is a wasteful number, since it uses less digits than its factorization.

556660660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19215 (or 19213 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 556660660 is about 23593.6571984930. The cubic root of 556660660 is about 822.6154148021.

It can be divided in two parts, 556 and 660660, that multiplied together give a triangular number (367326960 = T₂₇₁₀₄).

The spelling of 556660660 in words is "five hundred fifty-six million, six hundred sixty thousand, six hundred sixty".