5556533666 has 4 divisors (see below), whose sum is σ = 8334800502. Its totient is φ = 2778266832.

The previous prime is 5556533663. The next prime is 5556533681. The reversal of 5556533666 is 6663356555.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6663356555 = 5 ⋅1332671311.

It can be written as a sum of positive squares in only one way, i.e., 3010826641 + 2545707025 = 54871^2 + 50455^2 .

It is not an unprimeable number, because it can be changed into a prime (5556533663) 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 as a sum of consecutive naturals, namely, 1389133415 + ... + 1389133418.

Almost surely, 2^5556533666 is an apocalyptic number.

5556533666 is a deficient number, since it is larger than the sum of its proper divisors (2778266836).

5556533666 is a wasteful number, since it uses less digits than its factorization.

5556533666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778266835.

The product of its digits is 7290000, while the sum is 50.

The square root of 5556533666 is about 74542.1603255500. The cubic root of 5556533666 is about 1771.2015489496.

The spelling of 5556533666 in words is "five billion, five hundred fifty-six million, five hundred thirty-three thousand, six hundred sixty-six".