5557666 has 4 divisors (see below), whose sum is σ = 8336502. Its totient is φ = 2778832.

The previous prime is 5557663. The next prime is 5557723. The reversal of 5557666 is 6667555.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6667555 = 5 ⋅1333511.

It can be written as a sum of positive squares in only one way, i.e., 3515625 + 2042041 = 1875^2 + 1429^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (5557661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389415 + ... + 1389418.

Almost surely, 2^5557666 is an apocalyptic number.

5557666 is a deficient number, since it is larger than the sum of its proper divisors (2778836).

5557666 is a wasteful number, since it uses less digits than its factorization.

5557666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778835.

The product of its digits is 189000, while the sum is 40.

The square root of 5557666 is about 2357.4702543192. The cubic root of 5557666 is about 177.1321855099.

The spelling of 5557666 in words is "five million, five hundred fifty-seven thousand, six hundred sixty-six".