6555006665 has 4 divisors (see below), whose sum is σ = 7866008004. Its totient is φ = 5244005328.

The previous prime is 6555006583. The next prime is 6555006697. The reversal of 6555006665 is 5666005556.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2618573584 + 3936433081 = 51172^2 + 62741^2 .

It is a cyclic number.

It is not a de Polignac number, because 6555006665 - 2¹² = 6555002569 is a prime.

It is a super-2 number, since 2×6555006665² = 85936224756388844450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 655500662 + ... + 655500671.

It is an arithmetic number, because the mean of its divisors is an integer number (1966502001).

Almost surely, 2^6555006665 is an apocalyptic number.

It is an amenable number.

6555006665 is a deficient number, since it is larger than the sum of its proper divisors (1311001339).

6555006665 is a wasteful number, since it uses less digits than its factorization.

6555006665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311001338.

The product of its (nonzero) digits is 810000, while the sum is 44.

The square root of 6555006665 is about 80962.9956523349. The cubic root of 6555006665 is about 1871.5052332885.

Adding to 6555006665 its reverse (5666005556), we get a palindrome (12221012221).

The spelling of 6555006665 in words is "six billion, five hundred fifty-five million, six thousand, six hundred sixty-five".