556986666 has 8 divisors (see below), whose sum is σ = 1113973344. Its totient is φ = 185662220.

The previous prime is 556986649. The next prime is 556986671. The reversal of 556986666 is 666689655.

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

556986666 is an admirable number.

It is a super-2 number, since 2×556986666² = 620468292203591112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46415550 + ... + 46415561.

It is an arithmetic number, because the mean of its divisors is an integer number (139246668).

Almost surely, 2^556986666 is an apocalyptic number.

556986666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

556986666 is a wasteful number, since it uses less digits than its factorization.

556986666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92831116.

The product of its digits is 13996800, while the sum is 57.

The square root of 556986666 is about 23600.5649508651. The cubic root of 556986666 is about 822.7759705619.

It can be divided in two parts, 5569 and 86666, that added together give a triangular number (92235 = T₄₂₉).

The spelling of 556986666 in words is "five hundred fifty-six million, nine hundred eighty-six thousand, six hundred sixty-six".