6555647999 has 4 divisors (see below), whose sum is σ = 6555834864. Its totient is φ = 6555461136.

The previous prime is 6555647971. The next prime is 6555648007. The reversal of 6555647999 is 9997465556.

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

It is a cyclic number.

It is not a de Polignac number, because 6555647999 - 2¹² = 6555643903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555640999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23222 + ... + 116835.

It is an arithmetic number, because the mean of its divisors is an integer number (1638958716).

Almost surely, 2^6555647999 is an apocalyptic number.

6555647999 is a deficient number, since it is larger than the sum of its proper divisors (186865).

6555647999 is a wasteful number, since it uses less digits than its factorization.

6555647999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186864.

The product of its digits is 91854000, while the sum is 65.

The square root of 6555647999 is about 80966.9562167184. The cubic root of 6555647999 is about 1871.5662665748.

The spelling of 6555647999 in words is "six billion, five hundred fifty-five million, six hundred forty-seven thousand, nine hundred ninety-nine".