6555999 has 8 divisors (see below), whose sum is σ = 9255600. Its totient is φ = 4113536.

The previous prime is 6555971. The next prime is 6556003. The reversal of 6555999 is 9995556.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6555999 - 2¹¹ = 6553951 is a prime.

It is a super-2 number, since 2×6555999² = 85962245776002, which contains 22 as substring.

6555999 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6555929) 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 in 7 ways as a sum of consecutive naturals, for example, 64224 + ... + 64325.

It is an arithmetic number, because the mean of its divisors is an integer number (1156950).

Almost surely, 2^6555999 is an apocalyptic number.

6555999 is a deficient number, since it is larger than the sum of its proper divisors (2699601).

6555999 is a wasteful number, since it uses less digits than its factorization.

6555999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128569.

The product of its digits is 546750, while the sum is 48.

The square root of 6555999 is about 2560.4685118158. The cubic root of 6555999 is about 187.1599668302.

The spelling of 6555999 in words is "six million, five hundred fifty-five thousand, nine hundred ninety-nine".