5606656666 has 16 divisors (see below), whose sum is σ = 9070392744. Its totient is φ = 2583834624.

The previous prime is 5606656639. The next prime is 5606656687. The reversal of 5606656666 is 6666566065.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1765260225 + 3841396441 = 42015^2 + 61979^2 .

It is an unprimeable number.

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, 142711 + ... + 177706.

Almost surely, 2^5606656666 is an apocalyptic number.

5606656666 is a deficient number, since it is larger than the sum of its proper divisors (3463736078).

5606656666 is a wasteful number, since it uses less digits than its factorization.

5606656666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321105.

The product of its (nonzero) digits is 6998400, while the sum is 52.

The square root of 5606656666 is about 74877.6112466203. The cubic root of 5606656666 is about 1776.5113534869.

The spelling of 5606656666 in words is "five billion, six hundred six million, six hundred fifty-six thousand, six hundred sixty-six".