6655111999 has 2 divisors, whose sum is σ = 6655112000. Its totient is φ = 6655111998.

The previous prime is 6655111987. The next prime is 6655112033. The reversal of 6655111999 is 9991115566.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6655111999 - 2¹⁵ = 6655079231 is a prime.

It is a zygodrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6655111909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3327555999 + 3327556000.

It is an arithmetic number, because the mean of its divisors is an integer number (3327556000).

Almost surely, 2^6655111999 is an apocalyptic number.

6655111999 is a deficient number, since it is larger than the sum of its proper divisors (1).

6655111999 is an equidigital number, since it uses as much as digits as its factorization.

6655111999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 656100, while the sum is 52.

The square root of 6655111999 is about 81578.8698070769. The cubic root of 6655111999 is about 1880.9840931086.

The spelling of 6655111999 in words is "six billion, six hundred fifty-five million, one hundred eleven thousand, nine hundred ninety-nine".