5660660666 has 4 divisors (see below), whose sum is σ = 8490991002. Its totient is φ = 2830330332.

The previous prime is 5660660651. The next prime is 5660660699. The reversal of 5660660666 is 6660660665.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 4818442225 + 842218441 = 69415^2 + 29021^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 5660660666.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1415165165 + ... + 1415165168.

Almost surely, 2^5660660666 is an apocalyptic number.

5660660666 is a deficient number, since it is larger than the sum of its proper divisors (2830330336).

5660660666 is a wasteful number, since it uses less digits than its factorization.

5660660666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830330335.

The product of its (nonzero) digits is 1399680, while the sum is 47.

The square root of 5660660666 is about 75237.3621680080. The cubic root of 5660660666 is about 1782.1969953651.

Subtracting 5660660666 from its reverse (6660660665), we obtain a palindrome (999999999).

The spelling of 5660660666 in words is "five billion, six hundred sixty million, six hundred sixty thousand, six hundred sixty-six".